[QGIS-Developer] Filter by expression in Report(s)

[matteo]

Hi devs,

I think this is a feature request, but I'm unsure. In the Report Layout 
when adding a layer in a "Field Group Sections" within another "Field 
Group Sections", the layers must have a field in common that is used to 
filter the features.

If not, one can use the "join attributes by location" or create a 
virtual field with an aggregate expression.

Is there any interest to add a Expression Combobox instead of a Field 
Combobox in the Report Layout to filter the features "live"?

Or is there a simpler way I'm missing? :)

Cheers and thanks

Matteo