Showing Ads GridView React Native

[Karan0910]

I am working with GridView in which i have to show two items in GridLayout row count of 2 in React-native IOS.

The problem is that i have to show Ads after four items (i.e. 2 rows) that will cover width of mobile.But due to Span count the ads are also coming in Grid layout.Any help would be appreciated !!.

Want Output like this:-

but not able to implement logic for random data to show one ad after 4 items using DataSource.