Ikeas SYMFONISK Remote to control Surround Level

Hi all I am trying to configure a SYMFONISK remote to control the surround level of my Sonos beam which is a number entity (number.living_room_surround_level). I have tried doing this with home assistant automations and in node red but am at a loss of how to approach this. I am a beginner to the number entity and essentially what I want is when I press one button it increases surround value by 1 and the other button will decrease value by 1

can anyone help me?