EnergonRelics/src/main/resources/data/energonrelics/recipes/reactor_input.json

{
    "type": "minecraft:crafting_shaped",
    "pattern": [
        "#E#",
        "EHE",
        "#E#"
    ],
    "key": {
        "#": {
            "item": "energonrelics:circuit_board"
        },
        "E": {
            "item": "energonrelics:thermal_casing"
        },
        "H": {
            "item": "minecraft:hopper"
        }
    },
    "result": {
        "item": "energonrelics:reactor_input",
        "count": 1
    }
}