Export movie library data using Plex on My Cloud

Hi. I’m not sure if this is the right forum. If not, let me know.

I’d like to export my movie library data to CSV so I can import it on Letterboxd.

Some months ago I did it using the Webtools plugin and it worked just fine.

The thing is now I’m running Plex on My Cloud, and it seems I can’t install plugins using My Cloud.

Is there a way to export the data without using plugins? Or, better, some way to copy my Plex movie list to a Letterboxd list?

Thank you!