This page provides information on using the V-Ray Frame Buffer for post-production of EXR images rendered in Chaos Cloud.
Color corrections can also be saved and applied as a preset. Jobs submitted from Modo will have their color corrections written to the .vrscene file and rendered on the cloud, but if the render output is set to EXR no color corrections will be written to it since it's a raw image format. In that case the color corrections will be exported to a .vccglb file that can then be loaded with the VFB by right-clicking on Globals... and selecting Load.
Separate color corrections can also be saved and loaded using thebuttons. Once a preset is applied, you can use the Save current channel ( ) button to save the image in the format of your choice.
For more detailed information on color corrections with the VFB, please visit the following page.