Unfortunately, the Unicode sample page referenced in an earlier post
works only for some but not all subscript code values in the aistarter.exe emulator
and on my LePan TC970 device.
See attached blocks, DoIt shot, emulator shot, and .aia file.
The HTML label capability offered up for review to the open source group
might be helpful here.
The notifier component offers a subscript code capability, for what it's worth.
See the (?) link in the Designer drawer for the help details.
ABG