Enabling optical readout in the high-pressure gas TPC (HPgTPC) of DUNE's ND-GAr near detector

The usage of optical information is ubiquitous in neutrino detectors,~essential for spill-assignment, background suppression and triggering. Enabling an independent and complete physics program at the ND-GAr~component of DUNE's near detector suite will undoubtedly benefit from this feature,~too. We discuss in this presentation the prospects towards simultaneous readout of ionization and scintillation signals in ND-GAr and the R{\&}D~currently performed in this direction.