[CentOS] How to have two interfaces with dhcp using networkd but taking the dns/ntp stuff from only one

Ok, we can take both but needs to be in a specific order. So, we have
two ethernet interfaces, A and B. And both are defined in
/etc/systemd/network/ to use dhcp. How to guarantee that the crap
provided by dhcp to A (dns, gateway, ntp) is the default? To use an
example, /etc/resolv.conf should end up like

nameserver IP.for.A.DNS
nameserver IP.for.B.DNS
domain A.domain.com

Now, this must be done using only systemd stuff