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That would be great indeed!

I think the problem here is that this is a Gmail-specific, non-standard feature, meaning there is no specification that allows to implement this in a reliable, cross-client way.

However, Fastmail is working on something similar with JMAP.

I found this earlier HN comment to be really interesting: https://news.ycombinator.com/item?id=16372835

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> However, Fastmail is working on something similar with JMAP.

They are! [1]

"It really is coming in JMAP! Come along to IETF in London to have a play, or I'll be pushing out links to updated JMAP Proxy in the next couple of weeks and you can play with it there :)"

Once they've got JMAP nailed down, they'd just need to support Gmail's native API [2] for retrieving rich message data for their import process.

[1] https://news.ycombinator.com/item?id=16375101

[2] https://developers.google.com/gmail/api/guides/

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