This can be done in an .r2.js script by using curl, but i think it will be good to have this thing natively supported in r2frida like it is in frida-tools.

This is the oneliner:

A=pcipolloni/universal-android-ssl-pinning-bypass-with-frida
curl -s https://codeshare.frida.re/api/project/$A.js | jq -r .source

Ref https://github.com/frida/frida-tools/blob/main/frida_tools/repl.py#L903