Something like this:
{
"result": "cot",
"category": "CC_MISC",
"skill_pri": "mechanics",
"skill_sec": "survival",
"difficulty": 3,
"time": 40000,
"reversible": false,
"autolearn": true,
"tools": [
[
["needle_bone", 10],
["sewing_kit", 10]
],
[
["screwdriver", -1]
]
],
"components": [
[
["rag", 10]
],
[
["scrap", 10]
]
]
} ?