When using the system (version 20.11), we noticed that we didn't get a valid response when trying to export the material identified as article/analytics within the system using the .ris extension. When we tried to export or suggested users export analytics using a .ris file, the .ris file was invalid. It is effective for exporting information from monographic materials. Testing an external catalog, I got the same response when exporting information referring to articles; the file was simply null. The question is: can the script/template used as a basis for exporting information be modified? We know the script is opac-export.pl; in a standard installation, it's located in /usr/share/koha/opac/cgi-bin/opac. It should include fields 100, 245, 773, and 300. We have no knowledge of PERL.
I am sorry, but 20.11 is no longer maintained, so there won't be a fix for that version. If you want to have help for fixing this yourself, please consider joining us in the community chat on https://chat.koha-community.org or ask for hints on the mailing list. But you also might want to check if the feature works in the newer versions, using a sandbox or one of the demo sites linked on the website.