Soundiiz is supporting the import of QQ音乐 playlists to other streaming services with the Share link provided by QQ音乐 (the largest music streaming service in China).
For that, simply go to your playlist on QQ音乐 and use "Share" button to get an URL using "Copy Link".
The URL should like for example: https://y.qq.com/n/m/detail/taoge/index.html?id=4100249474
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 !