How can I use pinch gesture when testing an iphone app featuring google maps inside TestFlight on MacOS?

I am testing a mobile app, in Android and iOS. When running an iOS Simulator or Android Simulator, it’s easy to simulate a pinch movement just holding a modifier Key, like Shift, Command, etc. No problem here.

However when I want to test the same app, the release prebuild version, using TestFlight running on a Macbook, how can I simulate the the pinch gesture, to get a zoom in/out effect?

To simulate a pinch gesture on a TestFlight app running on a MacBook, use two fingers on the MacBook’s trackpad to perform the pinch movement, just like you would on a touchscreen.