How to add canonical to Unbounce pages

We are looking to run an A/B test where we completely re-design an organic landing page and its content. We will create the re-designed page on Unbounce and will re-direct part of the organic traffic from the organic page to the Unbounce page to testing.

How do we want to set up to set up canonical on the Unbounce page back to the organic page to ensure Googlebot knows the real URL?