QGIS Expression Builder: returning pair of values (e.g.: coord)

Question

Seems like this should be simple, meaning I'm probably "trying to do the wrong thing," but: I have a field (specifically, Label Placement's "Offset X,Y") that expects an input of type double coord. I want to do a data-defined override: pull the X and Y values from columns in the attribute table.

But, how do I return the two values as a single coord pair from the expression builder? Trying [x,y], (x,y), {x,y}, etc. all give a syntax error...

Answer 1

They must be converted to string in format x,y

You can use

"offset_x" || ',' || "offset_y"

or

format('%1,%2', "offset_x", "offset_y")

where offset_x and offset_y are your offset columns.