Much appreciated. Indeed works and if I use a table between 100 and 200 it seems I can reference it via a policy route target as well.
set vrf name vrf_dsl
set vrf name vrf_dsl table 1000
set interfaces ethernet eth0 vif 2 address dhcp
set interfaces ethernet eth0 vif 2 vrf vrf_dsl
Unfortunately I have trouble now that this table is indeed being used. I created a new thread for it: How can I make my wireguard tunnel accessible via policy routing?