How to data when there are multiple subcollection in a collection

Hello Folks

I am facing an issue regarding calling of particular data from a collection

In collection "persons" When there is only 1 subcollection, I am able to fetch data with adding backend query to column/row/list/text

But

In this case, in collection "RSI" there are 2 subcollection in total,

when I add backend query of RSI to column/row/text and call the data of "address" OR "age" OR "name"...

the output is found as null

How to fix it

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