So, the title explains it. CLI uses preferences file which allows population of arbitrary key/value pairs under "keys" for each storage section. GUI, however, uses duplicacy.json for configuration, and storages section there has corresponding subsection called "credentials". However, these values are encrypted (unlike "keys" for CLI). How can I add extra keys into GUI configuration file? @gchen?
Unfortunately there is no way to store extra keys into the GUI configuration file.
So the only way to pass such parameters would be just via environment variables?