Thanks@DanAt亚搏在线Safeand@erik_janI managed to use the generate list option in the dissolver adding the ListConcatenator to get my list of polygons separated by comma.
嗨@manuciaoTo see the list that gets created for every dissolved polygon,insert an Inspector or Logger after the Dissolver.Use a ListElementCounter if you just want a count of how many polygons were dissolved together.
Using the Dissolver settings (see image) you can create a list of the name attributes.
Then using the ListConcatenator transformer,you can concatenate those names into one attribute on the dissolved polygon.