Adding a clickable link in confirmation e-mails via JSON coding

Site URL: http://www.philly-fsbo.com

Hello!

I sell service products on my website. I need ALL order confirmed emails for my service products sent to customers to include a link to one specific page within my Squarespace site. The page will be in the not-linked portion of the site so that only those who have purchased the products can access the link. So, I'd like to customize the email to add that link, but I would like it to be clickable. 

Can someone help me write the JSON formatting to create a clickable link to that specific page?

Thank you in advance!

Really appreciate your help.

Why not add html to the confirmation email such as the following (using a scheduling link as an example)

Please <a href="https:www.yourschedulinglink.com">select a time</a> that suits for me to call you to chat about getting started.