[QGIS-Developer] QGIS processing model: extract specific attribute of a single feature to a string

[Andreas Neumann]

Hi, 

In a model I aggregate values to a single feature. Then I would like to
extract a specific aggregated attribute to a string so I can use it as
the input parameter of another algorithm. 

I fail to find a way to do that. Aggregation works fine, string
concatenation as well, but I fail to find a way to extract an attribute
of a single feature to a string. 

Any ideas? 

I'm on QGIS 3.10, but if necessary I could also use a newer QGIS
version. 

Thanks, 

Andreas
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