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Showing content from https://docs.aws.amazon.com/iot/latest/developerguide/dynamodb-v2-rule-action.html below:

DynamoDBv2 - AWS IoT Core

DynamoDBv2

The DynamoDBv2 (dynamoDBv2) action writes all or part of an MQTT message to an Amazon DynamoDB table. Each attribute in the payload is written to a separate column in the DynamoDB database.

Requirements

This rule action has the following requirements:

An IAM role that AWS IoT can assume to perform the dynamodb:PutItem operation. For more information, see Granting an AWS IoT rule the access it requires.

In the AWS IoT console, you can choose or create a role to allow AWS IoT to perform this rule action.
The MQTT message payload must contain a root-level key that matches the table's primary partition key and a root-level key that matches the table's primary sort key, if one is defined.
If you use a customer managed AWS KMS key (KMS key) to encrypt data at rest in DynamoDB, the service must have permission to use the KMS key on the caller's behalf. For more information, see Customer Managed KMS key in the Amazon DynamoDB Getting Started Guide.

Parameters

When you create an AWS IoT rule with this action, you must specify the following information:

putItem

An object that specifies the DynamoDB table to which the message data will be written. This object must contain the following information:

roleARN

The IAM role that allows access to the DynamoDB table. For more information, see Requirements.

Supports substitution templates: No

The data written to the DynamoDB table is the result from the SQL statement of the rule.

Examples

The following JSON example defines a DynamoDBv2 action in an AWS IoT rule.

{
    "topicRulePayload": {
        "sql": "SELECT * AS message FROM 'some/topic'", 
        "ruleDisabled": false,
        "awsIotSqlVersion": "2016-03-23",
        "actions": [
            {
                "dynamoDBv2": {
                    "putItem": {
                        "tableName": "my_ddb_table"
                    },
                    "roleArn": "arn:aws:iam::123456789012:role/aws_iot_dynamoDBv2", 
                }
            }
        ]
    }
}

The following JSON example defines a DynamoDB action with substitution templates in an AWS IoT rule.

{
    "topicRulePayload": {
        "sql": "SELECT * FROM 'some/topic'",
        "ruleDisabled": false,
        "awsIotSqlVersion": "2015-10-08",
        "actions": [
            {
                "dynamoDBv2": {
                    "putItem": {
                        "tableName": "${topic()}"
                    },
                    "roleArn": "arn:aws:iam::123456789012:role/aws_iot_dynamoDBv2"
                }
            }
        ]
    }
}