how do I get the current testcase render data in callback function?

[spwpun]

I want to write a callback function to process the current testcase data then use it to fuzz test.
how do I get the current testcase render data in callback function?
The origin callback fucntion seems to can't get it:

the test_case_context arg is a ProtocolSession, but it just contains the node, not contains the mutation_context:

Then if we need to get the current mutation testcase data, we must know the mutation_context:

[newbing9527]

Have you solved this issue? I’m facing the same problem.