Is there a way to do content grouping by landing page

Is there a way to do content grouping by "landing page". Recently when I was doing content grouping using GROUP USING RULE DEFINITIONS, it only provides options of grouping by page, page title or screen name. However, I would like to group the content by landing pages, which means only traffics landing on pages with certain patterns will be registered in a content group, is there any way to do this? Let me know if you have any thought, thank you :)