in your extension from chrome i can’t find the Pre-agreement for Portugal and i prefer to write that way? can you add that option. I can find it but it for brasil, angola and Mozambique so its a Pre AO that is missing.
However when i write it underline as yellow and alert about it 
Also i would like that it autocorrects when i write worls like ola it should be olá it could alert but correct it automatically the accentuation, is possible?
There is no autocorrect in LanguageTool. For that, you need a word processor like Microsoft Word or LibreOffice/OpenOffice Writer.
Regarding the pre-agreement for pt-PT it was Tiago Santos who worked on the reform stuff, so I don’t know how to implement it.
the extension detects that i write with pre-agreement ( has showed in image) however should be possible to have that on language selector.
I know, but I don’t know how to code it 
It was Tiago who did that part, and he is no longer part of the team.