How to change fontSize capability limits.

Ok, now I have sth like this:

"fontSizeValue": {
    "displayName": "Text Size",
    "type": {
        "formatting": {
            "fontSize": true
        }
    }
},

And the output is:

-Secondly, is there any option to leave data fields empty and eventually remove dataRoles from capabilities.json ? I am working on a totally static visual that doesn't need any data besides that entered with objects (Format tab). And my Visual is not updating unless I feed it with some data.

Thanks for the reply!

Michal