Can you use extensible flexfields in the Learning Module?

Summary:

We would like to add an extensible flexfield (EFF) to the learning assignment page. We need to be able to enter and track an override due date. An extensible flexfield will satisfy the requirements we have an prevent us from building a custom bolt on application

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Version (include the version you are using, if applicable):

New implementation 24B

Code Snippet (add any code snippets that support your topic, if applicable):