How to create Arrays of attribute inside an attribute

Hai i am new with appwrite i want to create a structure like

{
"user_name": "test",
"age": 100,
"ishuman": false,
"orders": [
{
"order_id": 90909,
"item_name": "alien food",
"item_price": 789
}
]
}

i cam create others attributes but how to create orders attribute

You should create an orders collection

I have already created but i can add it which attribute to choose ?

What do you mean?

You can't have an attribute inside an attribute

Alternatively you can have relationships between collections or use foreign keys

{
"user_name": "test",
"age": 100,
"ishuman": false,
"orders": [
{
"order_id": 90909,
"item_name": "alien food",
"item_price": 789
}
]
}

so this is not possible ?