Changing font size for ha-tile-info from config file

Hi, I want to change font size for all the (tiles) ha-tile-info .secondary using the configuration.yaml file, or the mushroom.yaml file.
I already have installed card-mod but I was not able to modify the font size for my situation.
Can someone point me to the right direction?

Card-mod is used to customize font size for some particular tile card(s).
Card-mode-theme - for all tile cards.
There are dedicated threads for both ways.