You can use filter or appropriate method (since I dont know what exactly you want to alter) and use string replace function
Probably I think that it is issue below.
Because Q2A don't appoint parameter of number_format() definitely, result may depend on locale. I do not have the experience corresponding to this matter, can you cope at qa-base.php (arround L112)?
I'm sorry if worthless.
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May 7, 2020: Q2A 1.8.4 released!