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Showing content from https://js.devexpress.com/Vue/Documentation/ApiReference/UI_Widgets/dxTreeView/Configuration/items/ below:

Vue TreeView - items | Vue Documentation

An array of items displayed by the UI component.

The TreeView works with object collections that can have a plain or hierarchical structure. Depending on the structure, the objects should provide different data fields. Specify the dataStructure property to notify the TreeView of the used structure and refer to the property's description for information on the required fields.

If you need to update the UI component items, reassign the entire items array as shown in the following example:

treeViewInstance.option('items', newItems);

As an alternative to items, you can use the dataSource property. It accepts the DataSource object, whose underlying stores provide an API that allows you to update individual items without reassigning the entire item collection.

Do not use the items property if you use dataSource, and vice versa.

Specifies whether the UI component item responds to user interaction.

Specifies whether or not the tree view item is displayed expanded.

Specifies whether or not the tree view item has children.

Selector: has-items

Default Value: undefined

This field is used when the virtual mode is enabled. It can hold a Boolean value or a function that returns a Boolean value.

Specifies the HTML markup to be inserted into the item element.

The TreeView component evaluates the html property's value. This evaluation, however, makes the TreeView potentially vulnerable to XSS attacks. To guard against these attacks, encode the HTML markup before you assign it to the html property. Refer to the following help topic for more information: Potentially Vulnerable API - html.

You can use the text property as a safe alternative.

Specifies the tree view item's icon.

Holds the unique key of an item.

Specifies nested tree view items.

Holds the key of the parent item.

Selector: parent-id

Default Value: undefined

This field makes sense no matter whether a custom template or the default one is used.

Specifies whether the TreeView item should be displayed as selected.

Specifies a template that should be used to render this item only.

jQuery

The following types of the specified value are available.

Assign a string containing the name of the required template.
Assign a jQuery object of the template's container.
Assign a DOM Node of the template's container.
Assign a function that returns the jQuery object or a DOM Node of the template's container.

The following example adds a custom item to the component.

$(function() {
    $("#treeViewContainer").dxTreeView({
        // ...
        items: [
            {
                // ...
                template: '<div>Custom Item</div>'
            }
        ]
    });
});

Angular

The following types of the specified value are available.

Assign a string containing the name of the required template.
Assign a DOM Node of the template's container.

The following example adds a custom item to the component. Note that Angular uses custom templates instead of the template property.

<dx-tree-view ... >
    <dxi-item ... >
        <div *dxTemplate>
            <div>Custom Item</div>
        </div>
    </dxi-item>
</dx-tree-view>

import { Component } from '@angular/core';

@Component({
    selector: 'app-root',
    templateUrl: './app.component.html',
    styleUrls: ['./app.component.css']
})
export class AppComponent {
    // ...
}

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { AppComponent } from './app.component';

import { DxTreeViewModule } from 'devextreme-angular';

@NgModule({
    declarations: [
        AppComponent
    ],
    imports: [
        BrowserModule,
        DxTreeViewModule
    ],
    providers: [ ],
    bootstrap: [AppComponent]
})
export class AppModule { }

Vue

The following types of the specified value are available.

Assign a string containing the name of the required template.
Assign a DOM Node of the template's container.

The following example adds a custom item to the component. Note that Vue uses custom templates instead of the template property.

<template>
    <DxTreeView ... >
        <dxItem ... >
            <div>Custom Item</div>
        </dxItem>
    </DxTreeView>
</template>

<script>

import DxTreeView, {
    DxItem
} from 'devextreme-vue/tree-view';

export default {
    components: {
        DxTreeView,
        DxItem
    },
    // ...
}
</script>

React

The following types of the specified value are available.

Assign a string containing the name of the required template.
Assign a DOM Node of the template's container.

The following example adds a custom item to the component. In React, specify the render or component properties.

import React from 'react';

import TreeView, {
    Item
} from 'devextreme-react/tree-view';

const renderCustomItem = () => {
    return <div>Custom Item</div>;
}

const App() = () => {
    return (
        <TreeView ... >
            <Item ...
                render={renderCustomItem}
            >
            </Item>
        </TreeView>
    );
}
export default App;