PBI Theming JSON - Missing Properties

Hi there,
I am heavily relying on theming via JSON. Here are some urls:
https://docs.microsoft.com/en-us/power-bi/create-reports/desktop-report-themes
https://github.com/MattRudy/PowerBI-ThemeTemplates

But unfortunately for some time now I miss some attributes and I cannot get a hold of it how to define these.
Example: matrix visual (pivot table)

• Column grand total
• Row grand total

Example: slicer visual

• Values --> border postion (top, bottom, left, right)

Another area are the already matured new shapes. The former attribute "shape" does not work with these anymore or many of the new fetures are not available to define, respectively.

I hope someone can shed some light on the situation. Greatly appreciated.
Thx, Axel