Hi, thanks for the kind words :)
Text codes should work everywhere so you could just use \fs[x] for changing the font size. I think by default there is no text code for bolding or other text effects like that but someone has probably created another plugin to add those text codes.
I will also be releasing a fix soon for line height with multiple lines (mostly that they weren't supported before), so this should also fix any issues that might arise in v1.0.0 for different font sizes.