So Zoho Sites easily supports creating a tel: link, to let users click a phone number and automatically open their default dialer, but is it possible to create an sms: link to open their default texting app? Something like this:

I've tried putting the

in the "Web URL" option, but it just says "Invalid URL."

Alternatively, is there a way to manually edit the html for a Zoho Sites element? I'm trying to do this on the "button with icon" page element. Could I set the button to some other link and then edit the html to actually use the sms: link?