You will need to write a plugin with a filter module. Here are the plugin tutorial and the filter module docs:
Specifically, take a look at the filter_question method.
You can use this plugin as a reference: https://github.com/pupi1985/q2a-maximum-tag-length
Welcome to the Q&A site for Question2Answer.
If you have a question about Q2A, please ask here, in English.
To report a bug, please create a new issue on Github or ask a question here with the bug tag.
If you just want to try Q2A, please use the demo site.
April 20, 2021: Q2A 1.8.6 released!