Yah. So far with searching using https://lemmyverse.net and right-click copying the community's full URL (not the !community@instance.link) and search ALL at my home instance works every single time.
Kind of? I have found that repeated searches do not help. Tho not completely sure I have been using full URL. I will start trying that and see if I have better success.
I think there is a genuine fan community around Trader Joe's. No need to subscribe.