How to allow multiple domains in NGINX Home Assistant SSL proxy addon in HA for security access

Hi

domain: xxx.duckdns.org
hsts: max-age=31536000; includeSubDomains
certfile: fullchain.pem
keyfile: privkey.pem
cloudflare: false
customize:
active: false
default: nginx_proxy_default*.conf
servers: nginx_proxy/*.conf

Since my company DNS blocks duckdns.org, I cannot access to HA from office. I tried to use another xxx.com domain, while still want to keep access duckdns.org out of home. How can config Nginx for this goal?

BTW: Where are those nginx *.conf files for Nginx add-on in HA? I searched in HA but didn’t find the location.