I think Lemmy and your home instance would need to support it to make it possible / easier
Boost For Lemmy
Community of the Android app Boost for Lemmy
Yeha, this is definetely not the responsibility of Boost. Custom Feeds are data that need to be stored in a database. If this is done in the local storage, then they'd dissappear if you switch devices. So, Boost would need to create a data layer somewhere in the cloud, and that's certainly not going to happen.
+1 to this it'd be amazing ๐๐๐
I definitely think this would be a huge value add. The decentralized nature of lemmy makes it so that there are a lot of different communities on different instances, that all are about the same topics. As an end user, it makes sense for me to want to see posts from all these communities in a single feed.
I saw that there is some work on the upstream lemmy side on providing support for multireddits/custom feeds, but upstream discussion also seems to indicate that different frontends, like Boost, should have the apis to be able to do this client side in the meantime.
Related:
- Support for grouping communities / multi-communities ยท Issue #818 - GitHub https://github.com/LemmyNet/lemmy/issues/818
- https://github.com/LemmyNet/lemmy/issues/3950