[Question] Is there a selfhosted Lemmy scraper/aggregator?

A common Google "hack" to get actual results it to add "site:reddit.com" after a search term--Lemmy, however is spread across a ton of instances. I was wondering whether there's a selfhosted search engine that is able to index lemmy posts from a certain number of instances (set manually) and that can be used to search for certain terms--is such a program being worked on? Or is it best to simply use the lemmy search bar on my instance?