How to integrate with PickleType

[kaito-albert]

I want to pass a list to the schema which uses SQLAlchemy's PickleType column.
The json file will looks like this:

json_data = {uuid: '123456...', coords: [[x1, y1], [x2, y2]]}

But looks like ma.SQLAlchemyAutoSchema treat PickleType column as string so if I do schema.load(json_data) it will say coords is not a valid string.
I use some trick like str(json_data(coords) before schema.load(json_data) and eval(json_data(coords) after. But when I do schema.dump(model), it will still convert coords to string. And I have to eval it again.
Is there better way to to integrate with PickleType? Or is there any way to skip the validation for specific column.

[iFreilicht]

I have the same problem. Did you ever find a better solution?