Read this https://support.clarivate.com/Endnote/s/article/EndNote-API-Support?language=en_US
and this https://community.endnote.com/t5/EndNote-API/Convert-HTML-Tags-sample-plug-in/m-p/18467#M40
And then contact endnote support on how it is supposed to work, and if it is still an option, as I haven’t ever tried it?