Description

I need to get the expiration date of the group.

Proposed behaviour

It should be obtainable using PlaceholderAPI.

Have you tried checking the placeholders page in the LuckPerms wiki? There is one for it, the very last one listed https://luckperms.net/wiki/Placeholders#luckperms_group_expiry_time_group-name

Yes, it is, but this is the remaining time until expiration. I would appreciate if it was possible to get an expiration date.

Ah I see what you mean. The suggestion would be best fitted in the LuckPerms/placeholders repo to keep track of it there :)