torparser does not work for ref inside a struct

When trying to parse the following a Parse Exception occurs:

M1_rim  elliptical_rim
(
  half_axis        : struct(x: "ref(beamradius)" mm, y: "ref(beamradius)" mm)
)

replacing the ref objects with values and removing the doublequotes fixes the issue. Removing only the double quotes or only substituting values does not fix the issue.