I am sorry but may I know if you are referring to the MagEZ Case 2 or Air Case?
If this is about the MagEZ Case 2, I can not guarantee if MagEZ Case 2 for Samsung S22 Ultra works with the Belkin Boost charger Pro 3 in 1 since we don’t have the Belkin Boost charger Pro 3 in 1 to do the test.
And there is a special MagSafe magnet array inbuilt into the MagEZ Case 2.
However, we do have the MagEZ Slider which is 100% compatible with the MagEZ Case 2 for Samsung S22 Ultra.
Or, if are asking about the Air Case for Samsung S22 Ultra, it should be 100% compatible with the Belkin Boost charger Pro 3 in 1 since the Air Case is not only 100% genuine aramid fiber made, but also without any magnets inbuilt.
You may also learn more about the aramid fiber here https://www.ipitaka.com/pages/material