[QGIS-Developer] QGIS expression to get internal ID of a feature in a related layer

[Andreas Neumann via QGIS-Developer]

Hi,

I am looking for a way to find out the internal id of a related layer 
with a QGIS expression.

@id and $id only work directly on the feature of the source layer, but 
not on related layers.

attributes(
   get_feature(
      'Other Related Layer',
      't_id',
      fkey_value
   )
)

doesn't contain the internal id of the other layer ...

Any ideas how to get access to internal ids of other layers?

Thank you and greetings,

Andreas_______________________________________________
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