No way to do this right now with the existing Gerrit API without downloading a really big amount of data per group, as far as I can tell. This is why this includes all groups in the first place. This needs an upstream change on Gerrit's API (and of course, we have to update to that version of Gerrit when it comes out).

Could do it the hacky way:

if ( groups.mediawiki || groups.wmf ) {
    delete groups.AhoCorasick;
    delete groups.at-ease;
    delete groups.base-convert;
    delete groups.CLDRPluralRuleParser;
    // etc.
}