How can we add approvals to flow designer based on only roles?

[Prasun2]

Hello Everyone,
I am looking at a use case where every order that gets submitted should gets approval from users based on their roles i.e. only users who have role xyz should be the approvers of the record. 
The 'Ask for approval' action in flow designer doesnt has the feature to add approvers based on role. 

Any suggestions? 

[GB14]

@GBS I followed the subflow approvals video by @rfedoruk  here  https://www.youtube.com/watch?v=nqKAQg9hZUI  to achieve it.