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

[Andreas Neumann]

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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