Hi
I know some pieces of software support LanguageTool as an Add-On.
(https://dev.languagetool.org/software-that-supports-languagetool-as-a-plug-in-or-add-on)
However, is there any plans to publish the new add-on for ApSic Xbench?
If not, may I suggest you create a new one, please? 
Andy