Usability of the Python syntax -- field comments

When I was writing my Python schema I noticed that I have to use a rather verbose syntax to add comments to a schema:

    x: Annotated[int, Doc("X-coordinate of the top left corner.")]

Looking at the translated TypeScript schema, this gets turned into the much cleaner

    // Top left corner coordinates
    x: number;

I would like to be able to use native Python in-line comments, like this:

    x: int  # X-coordinate of the top left corner.

I think this could be implemented by scanning the source code instead of, or in addition to, passing the schema data structure.

Start by tracing how Python schema data is translated into the TypeScript schema, comparing the current Annotated/Doc representation with the generated field comments. The issue names no files or tests, so first locate the schema translation entry point and determine whether source scanning can preserve inline comments. Done means Python inline comments produce the expected TypeScript comments without breaking existing schema handling.