How to add font choices to Visual Editor Pull-Down?

I am trying to figure out how to add other possible choices to the pulldown in the Visual Editor that has the H1, H2, etc. Is it possible to add some that I can name myself? Like “Big Red” thus keeping it separate from other theme & plugin functions that have already assigned H1, H2, etc for their own purposes?

OR is there a way I’m not seeing to just choose a Point Size for a font you’re using?

Hope I’m making sense! Thanks!