How to save array of json in mongoose

I have the next issue:

I have the variables like this:

links: [{linkTo: "aaa", text: "bbb"}, {linkTo: "ccc", text: "ddd"}],
style: {
      color: "green",
      backgroundColor: "#dddddd",
      borderStyle: "solid",
      borderWidth: 4,
      borderColor: "#bbbbb",
      borderRadius: 10,
      hoverColor: "#aaaaa",
      hoverBackgroundColor: "red"
}

and I want to store them in the mongo DB inside one field called LinksTree (using mongoose).

I tried the following but didn't work (goes stright to the default):

    LinksTree: {
        links: {
            type: Array,
            default: []
        },
        style: {
            type: Object,
            default: {
                color: "black",
                backgroundColor: "#dadada",
                borderStyle: "solid",
                borderWidth: 4,
                borderColor: "#dadada",
                borderRadius: 10,
                hoverColor: "#31941F",
                hoverBackgroundColor: "white"
            }
        }
    },

How can I solve that issue?

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