How to add RGB value to PointCloud2

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Dear forum, I am trying to visualize the position of blue and yellow points in Rviz. Therefore I am publishing a PointCloud2 wth the following fields:

• x
• y
• z
• classification
• confidence

The classification determines if the object is yellow or blue ans is a float property of either 0 or 1.0

Now my question:

What is the most optimal way to color the points in Rviz2 accordingly? Should I add RGB values to the PointCloud2 and if so how can this be done? Or is there a simple setting in Rviz2 for that?

Thank you very much in advance.