Stadia Rolls Out Game Save Sharing With Hitman 3 - https://www.gamespot.com/articles/st.../1100-6486279/

Hitman: World of Assassination gets a unique feature on Stadia that allows you to challenge your friends to take on your assassinations. (...)
Hitman 3 will be the first Stadia game to support State Share when it releases on January 20. Since Hitman 3 is also compatible with the missions released in Hitman and Hitman 2, those games will also include the State Share feature.