SAR image exported to gamma format, orbit information lost

I use SNAP 2.0. I want to export the ALOS 2 PALSAR data to gamma format, but in the generated .par file, the orbit information is lost. The .par file contains only 10 lines. While I test it with ALOS data, the result is the same.
So do you know how to export full header file to gamma format, containing all the orbit information?
Thank you!

Unfortunately, not everything gets saved into the format from the metadata just the basic band data.
Please let me know which fields you may need and their format as expected by gamma or stamps and I could add them.

Hi lveci,
Can you add doppler_polynomial in .par file? just like this