Import multiple settings to Extension Block

[Edoudou]

I am creating a block extensions with multiple settings. I also have an interface on my tool (which is not integrated to shopify) where I can copy those informations. I would like to keep is as multiple settings on shopify in case someone wants to manually set it, but I would also love to be able to import they all at once.

Is there a way to paste a string (JSON Format for example) and to fill all the fields at once ? Maybe with a button to click and a modal or i don't know.

Current state of the app : 

Block settings

Tool :