You are correct. There is currently an open issue[0] requesting support for migrating posts, that was opened in 2019 and unsurprisingly has some comments from

You are correct. There is currently an open issue[0] requesting support for migrating posts, that was opened in 2019 and unsurprisingly has some comments from today pointing out how useful such a feature would be. [0] https://github.com/mastodon/mastodon/issues/12423 https://github.com/mastodon/mastodon/issues/12423