I wanted a placeholder like
%luckperms_inherited_expiry_time_%
but to know the default expiry time of a permission, so if you set a permission of "2hr" to a player, you'll have a placeholder that will return "2hr".

It would be useful to give some datas to players, like "your permission expiry time is 30mn left on the 2hr I gave you"

Unfortunately, LuckPerms doesn't store this data, there's only a single property for the expiry time, not the time when the permission was given.