Installing HA on iMac M1 Silicon using UTM with no Ethernet (WiFi only)

I am new to HA and wanted to try it on my iMac on UTM, but seem to have a serious issue because I have WiFi only. Is there a workaround to get this going, or do I have to invest in some hardware?

I have meanwhile bought a USB-Ethernet adapter for my Wifi-only iMac and am now all cabled up.

It’s all running on Raspberry Pi Green now. Love it!