"Nobody" has to contribute anything to Lexilla - it's already there:
https://github.com/ScintillaOrg/lexilla/blob/0784d05075bd85cf151c480c0853771...
All that's needed is to add ```ini lexer.cpp.triplequoted.strings=1 ``` under ```ini [lexer_properties=C] ``` in Tools->Configuration files->Filetype configuration->Programming languages->filetypes.java