So, there’s no need to install the T4 plugin separately.
Yes, but I have new Joomla instalation before install joomlart package, because instalation is completely connected into new project on the own gitlab server.
Then first is Joomla 6 + git push, next is czech language + git push, next is n3t Debug plugin + git push, next is only T4 plugin...
Ok I prepare second joomla6 DEV vhost.