I don't see any way to save a template in Notion 6.5. I hope that I'm just missing something obvious, because it would really be a blotch on an otherwise great program.
FWIW, I create single-page lead sheets for our worship team, so that music can be viewed on an iPad, without any page turning. My chord and lyric font settings, among other things, are always the same. A template would save significant time.