Macro for Basilisk V2 mouse button

HI all! I'm trying to make a keyboard combination/macro to do the Keyboard shortcut "[Windows Key]+X"-key, followed by "U"-key, and then "S"-key. This should allow me to put my computer to "sleep" mode by assigning one macro key to a selected button on my Razer Basilisk V2. Using Keyboard Function won't let me combine the windows key and a second keystroke, and recording a macro doesn't work when I hit the assigned key. Grateful for any suggestions and would be great if a screenshot of the selected commands can be posted? Thanks much!