I'm missing a condition that checks if player has a specified group.

For example:
I want to promote a player using a track, but I want that to happen only if player has the first group in this track.
track: Builder->Stuff->Owner
player: has group Default
me: /lp user player promote track <-- and now this won't be executed, because the player has not the group builder.

I know that there is a batter way fo doing that but it's just a example

The condition perm would look like this:

cperms.has_group={group_name}.luckperms.user.promote.{track_name}

And that would work with other permissions too:

cperms.has_group={group_name}.luckperms.user.parent.set.{group_name}
cperms.!has_group={group_name}.luckperms.user.parent.set.{group_name}

or maybe even:

 _cperms.has_group={group_name}.essentials.home_

I know that ^this one^ doesn't really make any sense (cause u can just add 'essentials.home' to the group) but u get the point...

I don't know if that makes any sense to you.

As noted on the GitHub page, ConditionalPerms is no longer supported.

What you want to do is supported already anyway:

/lp user lucko promote staff --dont-add-to-first