hello and welcome to the forum,
not sure but these might help
https://forum.rclone.org/t/gomobile-cannot-build-rclone-librclone-gomobile-for-the-ios-target/28606/4
https://forum.rclone.org/t/rclone-on-ish-for-ios/20026/9
https://github.com/rclone/rclone/issues/4464