Python CMR does not seem to get the additional attributes from a granule query.
I am able to search for the additional attribute called "ID" for the following dataset but python_cmr does not allow a similar search.
https://cmr.earthdata.nasa.gov/search/granules.umm_json?short_name=gnssro_cosmic1_jpl_l1b&attribute[]=string,ID,cosmic1c1-G25-200703252358