Upgrading supporter pack on PS5

I want to upgrade my $100 supporter pack on the PS5 and was wondering if it is only possible to do so right now through POE1? That is the only place where the upgrade option shows up meanwhile on POE2 I still have the first 3 packs shown in the store.
Just wanted to ask if anyone else is experiencing this and if it is a good idea to upgrade packs through POE1. :)

I am also looking for this answer. Please let me know what you find out!