Can we please add H4, H5, and H6 to the RTE editor toolbar?

Current format:

Why can't we do this?:

Is there a plugin that does this? If not, I beg you to add this as the amount of switching between the RTE and the MD Editor is too damn high!

Thanks for any consideration.

I don't mean to be harsh, but did you even try to search plugins?

Maybe you didn't know this was possible.