I haven’t tried the Zigbee light switch but it does use the same Zigbee technology to connect to the Philips Hue Bridge as all the other Philips Hue lights and switches. Why not download the Philips hue app on your phone first and then try to connect the Zigbee switch to the Philips Hue app under accessories setting. Let me know how you go. Philips does have the option to expand via their Friends of hue option
Phillip globes paired to smart bridge which is then paired apple home and then you sink globes to rooms in apple home.
Siri then should be able to switch with a command.