hello and welcome to the forum,
rclone does not support that pcloud client crypt drive.
https://github.com/rclone/rclone/issues/4053
https://github.com/pCloud/pcloud-sdk-js/issues/16
if you have that pcloud crypt drive mounted as local storage, then rclone can access the decrypted files, same as any other application.
https://forum.rclone.org/t/pcloud-crypto-folder-how-to-use-configure-to-sync/15434
i would not use secret:, will lead of corruption of data in pCloud:Crypto Folder