No. ESL only exists in Special/Anniversary Edition. There's no such thing in Skyrim Legendary Edition. If you want port this to SE/AE, then you should be able to simply open the LE ESP file in in the SE/AE Creation Kit, do Ctrl-F4 on the NPC to re-export his FaceGen data in SE/AE format, and re-save the ESP as an ESL. It just uses basic vanilla resources.
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