HP – HP Series 5 Pro 23.8 inch FHD USB-C Conferencing Monitor - 524pm
This is a 23.8", 1920x1080 pixel monitor. It has three video inputs:
- USB-C (DisplayPort), with up to 100 watts of USB-C power delivery
- DisplayPort
- HDMI
A USB-C to USB-C connection could hook up video, supply power to the M4 MacBook Air, and presumably also connect the Webcam and downstream USB ports on the monitor (assuming the Webcam is compatible). I would look for a USB-C to USB-C cable that is rated to carry 4K video and to support USB-C Power Delivery.
You could use a USB-C to DisplayPort adapter (cable) or USB-C to HDMI adapter (cable). Those wouldn't provide any power to the Mac, and if you wanted to hook up downstream ports or the Webcam, you would need to make a separate USB connection (USB-B to USB-C ?!?) from the monitor to the Mac.
The description of the monitor says that it includes a USB-C cable.