Is there way to generate hot pools in an old world?

[CalciferAtlas]

I was able to generate a the new resonance area in my world as per the instructions on the update page. Is there a way to do the same for a hot pool?

I read a bit about migrating to 1.18. Can anyone link me further instructions on that if that's what I should be doing instead?

[Maelstrom]

hot pools are a terrain generated feature.  Gotta go on an explore in new chunks for them to generate.