Looks like Mervis isn't very useable after all and things have moved to node-Red.

will go there too.

I tried several components in my HTML HMI view but the variables don't show values and have a red dot above them.

I tried to use normal Global variables, modbus values and a lot more but it is very strange how this all functions.
I also don't understand why certain variables are only useable on text HMI parts and others only on the graphical HMI.