CalcInterior expression help in QGIS

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In QGIS on a new layer I'm trying to calculate the area of certain landtypes individually from a Grounds Maintenance layer. Previously I have used the following expression in Cadcorp SIS:

CalcInterior(Overlay('Grounds Maintenance',{Landtype$='Grass'}),'_area$',1) Which works fine in Cadcorp,but I don't know how to write the same expression to work in QGIS.

Any help much appreciated!



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