unfortunately the feature to allow for different bulletpoints for each child sku of an amazon variation group is not yet available with no eta on the horizon. this lack of functionality has caused me countless hours of manually fixing bullets once the variation group is listed. alternatively, if i manually create the variation group directly on amazon seller central when listing the child skus as individual skus first, there is a lot of time consuming work as well. Now for the latter there is an additional hurdle since amazon renames the child sku title to reflect the title of the parent sku - very undesirable since pertinent keywords are then lost!
I am reaching out to other users to determine if I am indeed not alone with this issue, as well as, if anyone has found a workaround to this problem.