hello
i hope that i understood your question correctly.
...and your are not talking about
the actual form fields or
fields in a struct-db or
individual words in a form field. in which cases my answer would be rather useless. ;)
depends on what kind of formatting you talking about. if you are happy with the formatting possiblities in the regular edit window (e.g. bold, italic, H1,...) you would do that formatting in your template.
have a look at Method 2 in the template mode of the plug-in (
https://www.dokuwiki.org/plugin:bureaucracy#template_mode)
where you hand over values via @@. just add the formatting you'd like in the template file.
e.g. **@@ingredient_A@@** for
Sugar
Am currently also fiddling around with the bureaucracy plugin and struct myself. not sure, how well documented and widely used it is.