curl is able to access gopher files, and newsboat has an "exec" command that can be used run commands.
So to read a gopher rss feed you can simply edit .newsboat/urls and add the following line:
"exec:curl gopher://url"
For example:
"exec:curl gopher://lucio.albenga.es/0/lfa/en/phlog/rss.xml"
ยง