Hi Eugeniya,
This is not possible as the notion of "when a lead is added to a smart list" does not make real sense from a Marketo standpoint. The lead is added to a smart list when a user runs the smart list and it qualifies for it.
If you really need this, create a date field in your schema (e.g. date_added_to_smart_list) and create a smart campaign that sets that date. Make that campaign a daily batch :
- Filters:
- Member of smart list IN your smart list
- date_added_to_smart_list is empty
- Flow steps
- change data value -> Attribute: date_added_to_smart_list -> New value: {{system.date}}
The usen the field date_added_to_smart_list as a grouping field in your lead performance report.
-Greg