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I was looking through the unpacked file that I find in /proc/config.gz on the host system.

There was: _# CONFIG_USB_NET_DRIVERS is not set_

What I also found is that, the host side counterpart to the gadget device's _g_ether_ driver, is supposedly the _cdc_ether_ driver.
I found mentions of _CONFIG_USB_NET_CDCETHER_ , _CONFIG_USB_USBNET_ and other USB_NET options that supposedly need to be onm in other posts elsewhere.
My config file does not contain that text except for the mentioned CONFIG_USB_NET_DRIVERS - but apparently, dependant options of a main option are not always also put into the config text file.

Generating a new kernel image, with the following items added to the kernel configuration, helped, and I now get a "usb0" interface shown under _ifconfig -a_ :

* CONFIG_USB_NET_DRIVERS
* CONFIG_USB_USBNET
* CONFIG_USB_NET_CDCETHER
* CONFIG_USB_NET_CDC_EEM

next to options generally enabling USB and enable it as a host (or dual role).
I'm not sure whether the last one is necessary, haven't tried. [Its description](https://cateee.net/lkddb/web-lkddb/USB_NET_CDC_EEM.html) sounded like it could be relevant, as it mentions a _usbX_ interface name, which I knew from the Raspi4-as-host experiment.