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You got me curious so I looked at asset from Unity Store and there is quite some:

There is free ones like https://assetstore.unity.com/packages/tools/particles-effects/gater-portals-system-59185

This one seems really great (but not free) and can play on scale (spoiler for FoE episode 2 ...), and there is a demo only

https://assetstore.unity.com/packages/tools/particles-effects/portalkit-pro-vr-a...

Even if you don't use Unity, it can be great for learning. I saw video of Memory of a Broken Dimension but did not know it was out, I need to try it!

I don't use Unity but yeah, it's always good to learn new things.

At the beginning I thought of making the teleportation stuff myself, but maybe I can use some assets too. Gosh I now want to make a game using these kinds of things so much I may start today (only maybe cause I'm sutdying right now. School is not easy and who knows if I got enough free time).

And Memory of a Broken Dimension is still just a demo and only has like 30-60 minutes of (awesome) gameplay. "This version is pretty old (2012) and not very representative of where the project is currently. "  says the author, so apparently when it gets released it'llbe even better.