Max,
You could write your own Latex grammar and import the "original one". Then you can have your own definitions like:
{ name = 'meta.package.acronym.latex'; begin = '(\(?:ac|gls|acimm)[sfl]?(fn)?{)'; end = '(})'; captures = { 1 = { name = 'support.function.package.acronym'; }; }; patterns = ( { name = 'support.function.package.acronym.acronym'; match = '[a-zA-Z,:0-9-äöüß]+'; } ); },
which you can then style and color as you like in your theme.
Dan