On LibreElec x64 addon Chrome does work fine!
On LibreElec on Raspberry 4 it is not offered in the addons. (Some "tricky" trials later I got some Chrome, but it does not work)
The only way seems to install rasp-Os and then Kodi??? I cannot believe it!!! I'm happy with LibreELEC and everything works as estimated. I just only want any browser to work.