You need to do some customization and may need to alter posts table. What I am describing here is just for an idea and a logic but there could be a better way to do.
First step:
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Create a column in qa_posts "answer_title" or if you want to create new table do that with FOREIGN KEY to answer ID with CASCADE
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Add a text input field to the new answer form as well as edit answer form using layer.
Second Step
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On answer create or edit event store/update the "answer_title" value to the newly created colum or table (a_post and a_edit)
Third Step
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Fetch the value from the table using custom query or modifying the list array variable (I haven't tested it yet but I am sure you can at least get by custom query if not modifying the list array variable)
All is done...
