Customizing a shortcut to Snap Cursor to Selected in the UV Editor used to work in 2.79
The syntax to define this shortcut is no longer working in 2.8+
That syntax is: uv.snap_cursor

After typing it in, the Target drop-down selector appears, indicating that Blender still recognizes the command on some level.
Furthermore, after performing this action using the standard ShiftS (and Pie Menu) the Console indicates that the command has not changed. It just doesn't seem to be assignable to a keyboard shortcut anymore.

What needs to be changed for this to work? Thanks.