How to obtain host address from Ubuntu guest ?

[freebrowser1]

Using a Ubuntu (ARM64) guest works fine, but I could not access the host (macOS Monterey on MBP M1) file system after installing Spice tools.
The 'builtin' run/user/1000/gvfs is usually empty or at least folders are inaccessible.
When mounting using davfs2, the file system is mounted, but all files are owned by root so are not accessible either. Despite I set

http://127.0.0.1:9843/ /mnt/hostdir davfs,rw,auto,user,rw,uid=myuserid,gid=davfs2,_netdev

in /etc/fstab. So I disabled it again.
Then I tried sshfs which does work

sshfs -o allow_other,uid=1000,gid=1000  myuseridmac@mylocalip:/Users/myuseridmac /home/myuserid/main

In my case myuseridmac is ths same als myuserid on Linux and 1000 is the Ubuntu user and group id of myusrid.
It works, but have to change mylocalip when I switch between home and work as it is a different network in the office.

How can I get mylocalip (which is the indoor IP address of my Mac in the network currently used) in UTM ?