Hi Olga,
It is very interesting question. You should create an "idea" post to suggest this functionality to Adobe Campaign R&D team.
In the meanwhile, you can have a look in the AC Reports, how the menu for exporting as PDF is done. And you can modify the Delivery form (xtk:form) to add an object button for calling a similar code for doing the same.
Well, it is a lot of Javascript development to adapt it, so it would be very nice that Adobe brings that functionality as factory one, rather doing specific development.
Regards
J-Serge