Network Blueprint Communication?

Hello there,

i have a multiplayer game where one player can change the Map (open function) while the server stay in the starting Map. That works so far, but
now i want to process data from the Player, its wsPosition for example within blueprints on the server. As there are no global Variables wich i could write by the player and read out by the server, i could need a little hint how to solve this.

thanks for any Ideas

Nobody any idea? - Maybe i can use the game class blueprint for exchanging global variable-data and handling then by tick? Even after map changes?