Hi @rgarrigue
there is no such option.
But you can use another solution.
Sample: Create a new subdomain acme.yourdomainname.com
(or another name), then redirects
http://yourdomainname.com/.well-known/acme-challenge/random-filename
->
http://acme.yourdomainname.com/.well-known/acme-challenge/random-filename
then run Certbot with the webroot of acme.yourdomainname.com
as authenticator.
Letsencrypt follows port 80 / 443 - redirects to the same or other domains.
So you can use one domain with one ip to create a certificate with a domain name with a lot of ip addresses.