Merging theses comments is supported using Polyspace Access as soon as you are uploading files in different projects. See -import-review option associated with Polyspace Access command polyspace-access: https://www.mathworks.com/help/polyspace_access/ref/polyspaceaccess.html#d126e1073
The import review feature in Polyspace Access enables Developer A and Developer B to upload their respective results to Polyspace Access, conduct reviews, add comments, and subsequently import their reviews into the general branch. Should these developers edit the same comments within two distinct sets of results, there exists a possibility that comments may either be overwritten or preserved.
