As I told you, you can not have jot behind cloudflare. So you have two options.

1. Add the DNS passthrough to cloudflare for jot.yourdomain.tld, make sure your SSL cert covers 'jot' - and be sure to configure everything accordingly.

2. Get a very cheap vps for jot. Kamatera has one for $4 that I use on setting up others.

Cons:

1. This will throw cloudflare warnings, because the DNS exposes your server IP - which is about the only reason to use cloudflare free.

2. You must setup the second server.

Pros:

1. Easy

2. Separates your jot server IP from your main server IP.