This seems to me like it's the most important aspect of making an account portable between instances, I'm hoping that something like this gets implemented in short order.
totally agree : federation makes sense only if you can import/export your preferences to another instance
There's a lemmy issue for this at https://github.com/LemmyNet/lemmy/issues/506, but it's unresolved. That issue is for a comprehensive account export, which is more than you're asking for.
It may be that today there is already some API that returns this list as JSON or something, the UI certainly displays some data about your subscribed community list and it must be getting that from somewhere. But I'm not familiar with this myself.
I am also interested in this
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