If you’re not an admin of the instance in question, no, there are no plans.
Your best option would be to regularly export a backup of your account from /my/preferences/account and build a way to migrate this into your own instance.
On an admin level, the activitypub plugin can do some of this but it’s more of a site feature than something individual users can utilize.
Our Discourse Hub mobile app (Share your feedback about the 🆕 iOS Discourse Hub app) does some of this (see a list of sites you’re signed up on, get notifications, see some hot topics)… but in the end it’s important for a lot of communities to see people on their site directly, so you will need to visit a site you’re signed up for to interact. We have considered doing more of this beyond the app before, but there are no concrete plans.