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Nested RG - how can I get "is loading"....?

Hi - I know how to do a loading icon when a RG is loading - its simple.
But I have some RG nested and problem is, that I can only see the Level1 RG now and cannot refer to the others…
Of course the “loading” is only done when RG5 is fully loaded - how can I pull the loading Info per Level?

thx
DOM