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Pushing object onto array which is inside an object (React)

I have an array inside an object addedCertificates and I want to push values into it.

   const addShift = () => {        
    setShiftList((prev) => [
      ...prev,
      {
        id: shiftList.length,
        date: '',
        startTime: '',
        endTime: '',
        addedCertificates: [],
        selectedCertificate: '',            
      },
    ]);               
};

When a button click occurs I want to push the selectedCertificate into the addedCertificates array. The function will look something like this:

 const addCertificate = (index) => {        
    const list = [...shiftList];        
    list[index]['addedCertificates'] = list[index]['selectedCertificate'];
    setShiftList(list);
    console.log('shiftList from add certificate', shiftList)
}

Right now the addedCertificates just get replaced with the selectedCertificate, but I want to keep the already added certificates. I cant seem to use .push on the array like this:

list[index]['addedCertificates'].push(list[index]['selectedCertificate']);

Does any one know how I can push values to this array?

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