Currently I used betterbibtex plugin for Zotero to export a biblatex file. I wonder if there is something similar but in hayagriva format.
More information, I use a command in my makefile to curl the server from Zotero/betterbibtex and it gives me the result in biblatex format. Would be nice to have a tool that does this in hayagriva format.
I tried searching online. Online search is bad now.
I don’t know whether its useful to you or not but I just want to post here for anyone looking, you could use Jabref. It has a Hayagriva YAML export option. The only minor issue is it puts three dashes — before and after the YAML data that you have to manually delete.