Assign a philips dimmer switch to one light bulb

I configured a raspberry pi 4 with a conbee 2 usb stick . I transferred all my philips light to conbee 2 gateway. I using deconz addon . All lights and dimmer switches was well transferred from my philips hue bridge

But when i setting up a philips dimmer switch is there any way to assign to just one light bulb and not to a group ? When i setting up a button on the dimmer switch its only assign it to a group and not one light.