There's no point for this, Skript didn't used to be able to send formatted messages, back then it had a purpose, but that was back in 2016, and as the title of the spigot page for JSON.sk says:
Here's how you can do some of the same stuff in vanilla Skript:
send "<tooltip:Hello!>Hover me!<reset>"
send "<link:minehut.com>Click me to go to the Minehut website!<reset>"
send "<cmd:/spawn>Click me to go to spawn!<reset>"
To see everything you can do, go to: https://skriptlang.github.io/Skript/text.html