How to define realm schema for property of object (or dictionary) with array as its value?

Question

I have data that looks like this

PersonJSONData = {
    "key1": {
        "name": "odo",
        "age": 10,
        "favorites": {
            "food": ["rice", "chocolate", "sugar"],
            "game": [],
            "color": ["red"]
        },
    "key2": {
        "name": "yana",
        "age": 50,
        "favorites": {
            "band": [],
            "food": ["eggs"],
            "book": ["ABC", "how to cook"]
        }
    },
    ...
}}

How do I write the schema in realm for react native?

const personSchema = {
    name: "Person",
    properties: {
        name: string,
        age: int,
        // favorites: I don't know what to write here??
    }
}

I tried using the type dictionary ("{}") but it's giving me an error:

[Error: A mixed property cannot contain an array of values.]

and when I used the type "mixed" I get this error:

[Error: Only realm instances are supported.]

Do I need to create an object type for that? If so, how to do it when I don't know for sure what the keys in favorites are?

Here is my code to create and write the instance.

const PersonInstance = new Realm(schema: [personSchema] })

function writePerson(){
    const personKeys = Object.keys(PersonJSONData)

    try { 
        personKeys.forEach((key) => {
        const { name, age, favorites } = PersonJSONData[key]
        
        PersonInstance.write(() => {
          PersonInstance.create('Person', {
            name, age, favorites
          })}
            
        })
    } catch(err) {
        // error handling
    }
}

or should I change how I write into the database instead? Can anyone help me with this? Thanks in advance.