Thank you @chris001
I created /public_html/.htaccess
Note: There is /public_html/public/.htaccess but I didn’t modify this.
This is what I used:
RewriteEngine on
RewriteCond %{HTTP_HOST} ^mysite.tld$ [NC,OR]
RewriteCond %{HTTP_HOST} ^crm.mysite.tld$
RewriteCond %{REQUEST_URI} !public/
RewriteRule (.*) /public/$1 [L]
Now I can access the site using https://crm.mysite.tld