Does prosemirror support varying font sizes?

Hi! Apologies if this question has already been answered before. I went through the examples on prosemirror.net and a few forum questions but couldn’t find it.

Prosemirror seems to support only six different sets of fonts, given by h1 to h6, like in this dropdown menu:

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Is it possible to specify more than six different sizes of fonts within a Prosemirror document? For example: in Outlook Web, the user can use any custom font size:

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It seems this was requested here: Setting Font style and size but I could not find any example implementations for it.