Hi Roberta,
Thank you for asking your question in our community. Currently, this feature is not supported on AppStudio Website. Please consider downloading AppStudio Desktop to create and custom Quick Report template source code to add your desired functionality (notice that Standard license is needed if you wish to build an app using AppStudio Desktop). However, we are planning to add this feature in 3.1 release for Desktop users.
Please let me know if you have any other questions.
Thanks,
Tina