Mavic 3E writes wrong height values in EXIF

Hello,
I use a Mavic 3E in Germany. The Drone writes ellisoid-heights (WGS84/EGM96) in the EXIF although my RTK mountpoint delivers orthometric heights (ETRS89/DHHN2016). I have a control point at 250m ASL and the drone writes 298m in the EXIF. This results from the ellipsoid/geoid differnce. There is no way in DJI firmware to adjust this, or does anyone know how? I read that normally one would load it in geotagging software like Agisoft or Pix4D, but I only have WebODM and it lacks the ability. So I either have to find a solution where the drone already writes the correct heights in the exif or I have to change the EXIFs of all my Images an substract the offset (~48m), which is quite the huslte for hundeds of images. Does anyone here ran into this problem and got a solution or tipps for me? Thanks!