Modulating laser power by fill density

On my old Trotec cutter, laser power is modulated by fill density, e.g. a 35% tint reduces the laser power to 35% of the materials setting. How do we achieve this with the Beambox? I find that Beam Studio seems to ignore vector fill altogether.

In principle it would be possible to separate the powers out into layers, but that’s far too onerous — just not a feasible solution.