How to pass data from one player to another in matchmaking?

Hi, I need help with using Matchmaking. I have already created a Matchmaking according to this guide: https://docs.microsoft.com/en-us/gaming/playfab/features/multiplayer/matchmaking/quickstart. I also clarify that I am using PlayFab with unity3d. Now I want to know how I can make paired players pass values to keys between them. Example: Player A and Player B are paired. Player A touches a blue button and creates for Player B a key called "Button" and valued "Blue". When pairing is complete, the "Button" key is removed. Ideally the key is created and removed via code within the matchmaking, but if this is impossible, if it can be created from the "Player Data (Title)" and edited in matchmaking, that works too. If there is a documentation or guide that can help with this, it would also be helpful. Thanks and sorry for bothering.