Anyone using wildcard cert from letsencrypt with duckdns in his HA setup?


I am trying to get a little bit more into this subject since i have HA already running with nginx proxy on a ssl cert.
Now i would love to have also ssl access to my NAS but for that i would need wildcard cert.
I found a couple different attempts left and right, but i am not able to transfer them to my HA so far…
so some hints or better cook book instructions how to run HA with nginx proxy manager or the simpler addon with wildcard certs from lets encrypt for extra subdomains would be highly appreciated.
Thx in advance!!!