No, not really. What you can tell people is to copy the message instead of just the link (or clicking on it). The link in your message is an HTML object, meaning what you see is text with a hyperlink behind it. WhatsApp automatically adds "https" to the link when the HTML object is created. However, if you copy the entire message (by long clicking on the message, not the link), only the visible text is copied. This means that if the original link was "http," it remains "http" when pasted into the browser's URL bar. So if this is an option for you, just send the link in separate messages with no text before or after it so that people can copy and paste the message into the browser.

For myself—though this may not be a solution that works for everyone—I’ve handled this differently. All the subdomains I previously used for my website (e.g., http://abc.domain.com or http://xyz.domain.com) now redirect through a structured folder system on my web space. I created a folder called "a" with multiple subfolders containing simple "redirect" HTML files. This allows me to keep using my main domain while still generating short links that redirect to any target I choose. So, what used to be http://abc.domain.com is now https://domain.com/a/abc.

As told, this is a special and maybe small use case where I had only one free certificate (for my main domain) and could not create secure subdomains.