Migranting PlayerPrefs local saves to Google Play Games Saved Game. 2

Currently my game save all progress in local using PlayerPrefs, we are moving forward trying to implement Google Play Games Saved Games (Snapshots) and integrating the all players’ save to there.

Since PlayerPrefs use key-value pairs but Snapshots just use plain [bytes], I would like to know if there’s already a script or plugin for it to save my time? Or I will need to do data serialization from the PlayerPrefs on my own, just like taught in. 2