Cannot delete IMAP/POP3 account added to Gmail app

Any nonstandard way to delete an IMAP/POP3 account added via Gmail App, when System Settings do have not the "remove account" option? Seems my manufacturer (Xiaomi) has made something wrong there, on their Factory Firmware? Or is Google the one blocking it? On other accounts, it is possible to delete. I also have tested to delete Gmail app settings, but the IMAP account still survives. My phone is rooted and is at Android 11.