Hello ppant,
If you use the following line for the export, it would save the points in XYZ format with all the color values for each band:
chunk.exportPoints(path, format = PhotoScan.PointsFormatXYZ, colors=True, normals = False, projection = chunk.crs)
For example for RedEdge camera (XYZ coordinates and five columns for each band):
-118.085147 43.807395 270.040545 8134 27082 11837 28847 43749
-118.085095 43.807428 270.254913 7510 28259 11526 31415 38258
-118.084987 43.807414 270.669534 6222 26099 9771 28367 35536
-118.085094 43.807376 270.478392 20337 27852 22285 20669 17387
-118.085054 43.807340 270.855176 13217 25274 10200 24758 31883