After a lot of testing, I can say that it is possible to do some workaround for you, but it will be quite uncomfortable to use.
- It will be impossible to find out the correct count of Calls for Leads in two Campaigns at the same time.
- You will need to check the box that will update this count, and then update the entire page to display the correct count of Calls for Leads. And so every time for every Campaign.
I don't see any way to implement this functionality even through Reports (Advanced Pack extension feature).
I am sure that the functionality you need can be implemented by modifying the EspoCRM files, but I do not have enough experience to help you with this.
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