Setup Wildcard-SSL to a bench installed in virtualbox

I have a Multi-tenancy sites under one bench installed on VirtualBox Ubuntu server, I bought recently Wildcard-SSL certificate in a format of Pem-Chain and I want to install it for each site
the sites available is as follows:
taking into consideration that I have already done the port forward, so the accountant should access the sites via for example and then the browser should forward to
any ideas for help

If you are using Ngnix for hosting, you can use the same certificate for all sites in the conf file.

ssl_certificate   /etc/certificate/site1.pem;
ssl_certificate_key /etc/certificate/privkey-site1.pem;

Use same certificate for site2 also as it is wildcard.
ssl_certificate /etc/certificate/site1.pem;
ssl_certificate_key /etc/certificate/privkey-site1.pem;

Having said that, you need not purchase SSL certificate as letsencrypt works perfectly with ERPNext.

The problem I got error “ssl directive is deprecated” and the page didn’t open
the following are the steps I follow

bench config dns_multitenant on
bench set-ssl-certificate /etc/nginx/conf.d/ssl/mydomain_com.crt
bench set-ssl-key /etc/nginx/conf.d/ssl/
bench setup nginx
bench setup reload-nginx

Any suggestions !!

When searching I found there is command

bench setup wildcard-ssl

it is for setup wildcard SSL certificate for multi-tenant bench
any help in this