The 3d solver in HL9.2 would not take it into consideration. it was one of its limitations. A second step outside of the 3d solver was required in linesim to connect ports on the pads of the capacitor (open in the 3d solver) with a capacitor and extract an s parameter model for the whole linesim schematic.
The new solver in HL 9.3 can use capacitors directly during solve.