[Samba] BIND9_DLZ with Ubuntu 20.04

[Stefan Just]

On Ubuntu 20.04 I have provisioned a AD DC using samba-4.12 from Louis'
Repo and his instructions:
https://github.com/thctlo/samba4/blob/master/full-howto-Ubuntu18.04-samba-AD_DC.txt

In the output of:
samba-tool domain provision --use-rfc2307 --realm=XXX.XXX --domain=XXX
--dns-backend=BIND9_DLZ --adminpass=XXXxxx

I see this:
WARNING /usr/lib/python3/dist-packages/samba/provision/sambadns.py #978:
BIND version unknown, please modify /var/lib/samba/bind-dns/named.conf
manually.

named -v returns: BIND 9.16.1 Ubuntu (stable release)

There is no file /usr/lib/x86_64-linux-gnu/samba/bind9/dlz_bind9_16.so.

Is it somehow possible to use BIND9_DLZ with Ubuntu 20.04?