Retrive one file from backup, .vma.zst?

So I was too quick celebrating a move from one VM to another... I forgot ONE file.
Lucky for I have backups! But every VM like this vzdump-qemu-110-2021_08_01-02_00_02.vma.zst.
I read about the VMA tool but how do I unpack a .zst? Or how do I get that darn hidden file that I missed?