You can add more properties to the "Session End" event in Mixpanel by going under Project Settings to Session Settings and selecting the list of properties you wish to be associated with. These properties will then be accessible for analysis in Mixpanel reports. However, please note that there is a limit of 4 additional properties that can be associated with session analysis.
Here is the list of default properties associated with a session:
- $app_build_number
- $app_version_string
- $browser
- $city
- $country_code
- $current_url
- $device
- $manufacturer
- $os
- $region
- mp_country_code
- mp_lib
- mp_platform
- utm_campaign
- utm_content
- utm_source
For more details, you can refer to the Mixpanel documentation.