How to sync two different signals inside a store maybe

import { batch, createComputed, createMemo, createSignal, on, untrack } from "solid-js";
import { createStore } from "solid-js/store";
import { render } from "solid-js/web";


function App() {

  const [my_array, set_my_array] = createSignal([3])

  const array = createMemo(() => my_array())

  const [p_store, set_p_store] = createStore({
    get array() {
      return array()
    },
    cursor: 0
  })


  const fail_computation = createMemo(() => p_store.array[p_store.cursor].array_access)

  batch(() => {
    set_my_array([1, 2, 3, 4])
    set_p_store('cursor', 3)
  })

  const on_reset_array = () => {
    set_my_array([])
  }
  

  return (<><button onClick={on_reset_array}></button> </>)
}


render(() => <App />, document.getElementById("app")!);