Not sure if it will be in BG3 or not, but from the description of the teleportation spell, it looks like you can teleport anywhere that you have loot from without issues.😊
If you're a level 9 wizard, sorcerer or bard yes, it looks like you can teleport from everywhere to a permanent teleportation circle you've learned the runes before.
It would be a great power to have after we leveled up. But why would we need it in BG3 ? Everyone can already do it (and even more, you can teleport from and to locations without teleportation circle - which is not what the "portals" are but whatever, just another incoherence among others).
