Hi CV,
I see that you have setup Standalone Atlas on CDH edgenode. Though I haven't tested this setup, ideally Apache Atlas should have the pre-defined system types (DataSet). Let me know if you tried creating custom Entities via Atlas API to check if it's getting reflected in the Atlas UI or with the atlas hive import script if it popultaes the meta[1]
<atlas package>/hook-bin/import-hive.sh
Also, are you observing any exceptions on Atlas Metadata Application logs? You can also attach the atlas configs here to compare validate with CDP/HDP cluster configs if something missing.
[1] https://atlas.apache.org/1.2.0/Hook-Hive.html