Does Matomo Cloud have a feature similar to Google Analytics Content Groups?
I have been hunting for this as well and do not find an apples to apples feature match. What I am doping instead is using an Action Dimension. I have called this “Content Group.” Then I use GTM to push the line with the content group name into the Dimension.
I do wish there was a RegEx method in the Matoimo UI to handle this as my work around is more technical than I would desire.