Hi @cherry933 - Color.io already has two ways to change white balance:

Per Image

For every individual image or video you can click "Edit" next to the thumbnail gallery at the bottom of the viewport, then click the "Color" icon and adjust the temperature slider. This changes the color temperature of the individual image in a scene.

For the entire Scene

Adjust the Spectral Balance tool along the X-Axis of the control. This changes the color temperature of all images in a scene.