Ray yes you can, but you'll need to prepare the style template on the Mac.
You can place the ttf file (DynaPuff.ttf for example) into the template bundle and reference it in the template similar to that:
@font-face {
font-family: "DynaPuff";
src: url("DynaPuff.ttf");
}
So if the template works like this on the Mac…
You export it from the Mac, place the exported template on the iCloud Drive and import on the iOS device.
When selected on the iPhone, this is how it gets rendered:
