Soundiiz is supporting the import of Gaana playlists to other streaming services with the Share link provided by Gaana (the largest music streaming service in India).
For that, simply go to your playlist on Gaana and use "Share" button to get an URL using "Copy Link".
The URL should like for example: https://gaana.com/playlist/gaana-dj-hindi-top-50-1
Then simply go back to Soundiiz, tab Playlists and use "Import playlist" button in top right of the interface and select "By URL". Then paste your URL and follow steps !
Few songs could maybe not be retrieved due to catalog / licensing rightsholders.