How to edit an API data of array

I have an array in which the data is coming from Server API.

Data format from API

raw: any = [];

{

   data_from: "2021-11-18"
   data_to: "2021-11-17"
    id: "1"
    material: [
        {
            id: 'm1',
            qty: null,
            mid: 22
        }
    ]

}

I want to apply changes to existing data or add new data inside the array of material.

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