Set indexer inside a ref struct without assigning variable?

public SampleClass {
    private int[] m_sampleArray; // Assume has values

    public Accessor this[int index] => new(this, index);

    public ref struct Accessor {
        private readonly SampleClass m_reference;
        private readonly int m_index;

        public Accessor(SampleClass reference, int index) {
            m_reference = reference;
            m_inedx = index;
        }

        public int MultByTwo {
            get => (int)m_reference.m_sampleArray[m_index] * 2;
            set {
                m_reference.m_sampleArray[m_index] = (int)value * 2;
            }
        }

        public int DivByTwo {
            get => (int)m_reference.m_sampleArray[m_index] * 0.5f;
            set {
                m_reference.m_sampleArray[m_index] = (int)value * 0.5f;
            }
        }
    }
}