Well, seems to add directory API inspired by Mastodon in next release.
If the endpoint stays open to public Pleroma accounts are going to be listed in

There are already 26 nodes running fresh develop build that has the new enpoint exposed, so their users can now be found in

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Škorpil's Mastodon

Štěpán Škorpil's personal Mastodon server - instance of federated social network