Set the font of a TextMeshProUGUI component BY CODE

Hello Unity friends,

I would like to set the font of a TextMeshProUGUI component (named unitName below) by code, but I can't seem to do it. I tried two different ways and both failed.

1. Directly set it with

unitName.font = Resources.Load<TMP_FontAsset>("Fonts/DalelandsUncial-BOpn_SDF.asset");

This compiles fine but the font isn't applied during runtime. I have to drag it myself during runtime for the font to be changed at last.

2. Adding

unitName.LoadFontAsset();

or

unitName.UpdateFontAsset() right afterwards, but the member function LoadFontAsset is protected, and the other function didn't help either.

Help me please, I'm sure there's a way out for something as simple as that! :)