App / App Mindmap (Nextcloud 17) change default fonts

Can I change the default fonts in the Apps and Mindmap?

I installed collabora online (compiled myself, no docker) and I can replace the default fonts.
The aim is that all tools producing documents in Nextcloud use the same stock of fonts.

Kind regards, go4ncloud

Found the solution by myself. One can change default fonts of by using Configuration (Menu -> Extras -> Configuration):

    "defaultFonts": [

Confirm the new configuration with Apply and then reload
Don’t forget to install the fonts as system fonts (/usr/share/fonts).

Kind regards, go4ncloud