This is the PR where they added that feat. They didn’t provide a better UI due to some performance constraints. But you can find what hooks those indexes correspond to if you go to the components tab in dev tools and inspect said component; in the hooks section, you’ll have a tree of the called hooks, and for each hook, a small number at the left which is the index. You’ll probably need to unfold the tree of hooks to find them.
Here’s a screenshot from the linked PR
