All the supermarkets seems to sell the same brands and I have no idea if any of them are mostly processed in Europe or elsewhere in the world.
Do you have recommendations? I like the ones with a fruity taste more.
This one is my current favorite:
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They claim on the package that they care about sustainability, better working conditions and social engagement.
Do you count herbal tea? We have a lot of that in southern Europe. Here’s some from Greece (probably not exported though) https://www.finoherbs.gr/en/product-category/teabags/ This site is very low on details but most of these herbs grow here naturally and they probably do in adjacent countries too.