Pinned Files, currently in alpha, will provide a way to refer to specific files (of any kind) from your notes.
Currently, this is where you need to add your JSON files if you want to use them in Live Code Views.
Open the Pinned Files drawer
command-P or go to
View > Toggle Pinned Files.
Add a pinned file
Pick a JSON file.
(Optional) Click on the star icon
You can click on the star to make the pinned file show up in the Pinned Files drawer.
The file immediately shows up in the Pinned Files drawer.