I was just looking for this info. From the development guide for v. 1.2:
<<The following text styles are supported in iOS: bold, italic, underline, title case, uppercase, lowercase, word underline (appears as underline), double underline.
iOS doesn’t support: highlight, strike through, condense, extend, small caps, superscript, subscript.>>
Go can't apply text styles within a field, and if you try to edit a field that already contains mixed styles from Pro editing, including things such as centering, it all reverts to plain, left-justified text.
If a field is formatted with one of the supported styles, text you enter will adopt that style and appear OK in Go. I suspect that if the field is formatted with an unsupported style, it will adopt the style as well -- you just won't be able to see it when the database is open in Go. When opened in Pro, it will appear as desired.