Options to modify Android project build.gradle from Projucer

JUCE has options to append custom attributes and values to the generated app build.gradle file on Android.
This is great, however there’s a higher level build.gradle file on the project level.

I looked into Projucer and didn’t find any options to customise the latter.
For now I can update it manually, but was wondering if I’m missing something.

I’m integrating JUCE and Flutter and would need some extra attributes.
Any tips on appending custom values?