SI.EXPANDACCOUNTSINGROUP return child account groupings by account group

We have a number of nested account groups it would be useful to have SI.EXPANDACCOUNTSINGROUP or a similar function return an array which shows the nested names and account numbers. 

Example:  

Lets say we have an account group Revenue,  it is comprised of two account groups Contributions and Registration.  
Revenue:  Contributions , Registration 
     Contributions: 40000,40010,40020,40030
     Registration: 40060,4007

Current function of SI.EXPANDACCOUNTSINGROUP(connection,"Revenue")  would return all of the account numbers:

What would be helpful to get is an array like the below:

This could be done with SI.EXPANDACCOUNTSINGROUP  with a parameter flag like [expand child groups]  or as a separate function

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Name: Roberts, Tom

Excel version: PC 16.0.17328.20282

Connection: MADD

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