These commands installed the certbot on SLE 15 SP2:

sudo SUSEConnect -p PackageHub/15.2/x86_64
sudo zypper ref
sudo zypper install python3-certbot python3-certbot-nginx

And then, this command enabled HTTPS for all the servers handled by NGINX:

sudo certbot --nginx

Problem solved =)

These commands installed the certbot on SLE 15 SP2:

sudo SUSEConnect -p PackageHub/15.2/x86_64
sudo zypper ref
sudo zypper install python3-certbot python3-certbot-nginx

And then, this command enabled HTTPS for all the servers handled by NGINX:

sudo certbot --nginx

Problem solved =)

Note

Don't forget to automate renewal by this:

https://certbot.org/renewal-setup