In Pro Video on Galaxy S22, how can I use a white sheet of paper to update the "White Balance" temperature?

[Bak128]

Hello

In Pro Video, on a Samsugn Galaxy S22 Ultra, how can I use a white sheet of paper to update the "White Balance" temperature?

Thanks

J

[Tourbillon De La Vie]

Update as in set it up manually? Just click on WB button while in pro mode and change from auto to manual  by clicking on the scale