I am just learning so I don’t want to steer you wrong … A possible solution might be what I did this morning. I too wanted to format my notes. I decided that, since I can easily color entries by their tags, I set up some unique tags so I could play with my formatting in notes. Yes, that means I have to put the appropriate tags after each notes section I want to alter, but my tags are light gray and it isn’t distracting to me.
// Colors the tag “@headder2” blue, size font.
color: rgb(42, 84, 165);
// Colors the tag “@headder3” grey, size font.
color: rgb(115, 115, 115);