I think that (at least) 3 common definitions should be provided for https://github.com/stac-extensions/processing#expression-object to better guide users.
a generic "python script entry points" similar to what setup(entry_point=...) or poetry.scripts expect
(e.g.: my_package.my_module:some_function or my_package.my_module:SomeClass.a_method)
a URI based reference to a script or executable
(somewhat relates to Add a Software object #29 about the href requirement)
(for this, I would suggest that "expression": {"href": "<uri>", "type"; "<media-type>"} is used, since expression allows anything)
some docker container or similar, using an expression like ghcr.io/NAMESPACE/IMAGE_NAME:latest (or a more explicit docker run call)
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