How can I make a gui that uses json recipes instead of procedures?

I'm trying to make a gui that would create it's own recipe type and use vanilla style recipes instead of creating a procedure that contains each individual recipe inside it.
For example, I could make a recipe like:

{
  "type": "mod:custom_recipe_type",
  "base": {
    "item": "mod:input_1"
  },
  "addition": {
    "item": "mod:input_2"
  },
  "result": {
    "item": "mod:output"
  }
}

It's essentially just a smithing table, but I won't use a regular smithing table for balance reasons. (The output items will be cheap and powerful, so the block to make them has to be very expensive) Does anyone know a way to do this?