Need help with attributes

I was trying to make low gravity boots and came up with this piece of code:
{
"function": "set_attributes",
"modifiers": [
{
"attribute": "minecraft:generic.gravity",
"amount": 0.027,
"operation": "add_value",
"slot": "feet"
}
]
}
it results in an error making entire item_modifier unusable

EDIT: I GOT ITTTT
i just had to add all the array components for it to work. Final code looks like this:
{
  "function": "set_attributes",
  "modifiers": [
    {
    "attribute"; "minecraft:generic.gravity",
    "operation": "add_value",
    "amount": -0.04,
    "operation": "add_value",
    "id": "gravity",
    "slot": "feet"
    }
]
}

  also idk why but it must be full minecraft:genetic.gravity in "attribute", but gravity only in "id" is enough