What if the country I'm going to does not support eSIM?

Understand that “eSIM Support” only refers to the ability of the local carrier to PROVISION an eSIM for one of their own users.

An eSIM will work and roam on a network ANYWHERE a nanoSIM from the same carrier would work.

You would need to purchase a model outside the US, preferably in the country where it will be used.

If you intend to use it in the USA most often, get a roaming plan from an USA carrier.

If you intend to use it in the other country most often, buy it from a store there.

You'll likely be denied warranty service outside the country of origin.

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See information in Use eSIM while traveling internationally with your iPhone - Apple Support