Can I Redirect to a Third-Party Site w/ Page Rules?

I’m not sure if this is even possible, but I wanted to at least ask. I currently use a Cloudflare domain in conjunction with Fastmail. I was wondering if I could also use the domain such that if someone were to type that particular domain into a web browser, it would redirect them to a third-party page such as this:

Is this even something possible/allowed to do? Apologies in advance for my ignorance on this.