build.gradle

class PropExtension extends Closure  {
  final map = [:]
  PropExtension() {
    super(null)
  }

  def methodMissing(String name, args) {
    map[name] = args[0] 
  }
}
 
android {
  productFlavors.configureEach { flavour ->
    flavour.extensions.create("customProperties", PropExtension)
  }
}

android.applicationVariants.configureEach { variant ->
  var map = variant.productFlavors.find({ it.dimension == 'other' }).extensions.customProperties.map
  //do something based on map
  println map
 }

android {
	flavorDimensions = ['other']
  //....
  productFlavors {
    flavorA {
      dimension "other"
      customProperties {
        propertyB "property2"
      }      
    }
    flavorB {
      dimension "other"
      customProperties {
	propertyA "property1bis"
      }
    }
  }
}