Dimming light by holding the button

Hello everyone,

I´m completely new with Smart Home, my question is: How do I create an automation for dimming my light.
I bought this product from Ikea and connected it to my Home Assistant wirh Zigbee2Mqtt.
(TRÅDFRI Set mit Fernbedienung, Weißspektrum, E27 - IKEA Deutschland)

At the moment I can dim the bulb my holding the button, but it change the brightness only one time.
I want to dim the bulb by pressing the button till I stoped.
Can anyone helped me?