[NTG-context] remove full stop after a title ending with punctuation

Dear List, If an article is "How about this?", in the bib list, it will be printed like author1, author2, ..., How about this?. Journal name... I am trying to remove "." after "?" From reading documents, I think I should change (bibl-apa) \insertarttitle{\bgroup }{\egroup. }{}% Right now it will add "." in all cases. Is it possible that I can change it to conditional statement. Something like if the original title ends with punctuation, do nothing, otherwise, add ".". Hope that I made myself clear. Thank you! Best, Peng