How to make the array to show the values as clicked not as a list

Question

I have this code and when I click a number the object.keys gives me an array that starts form 0 to 10. is there another way that when I click 8 to show me the first position number 8 and second position for exp 2. Because it gives me the contrary.

const runner = Object.keys(accoppiataTrio.byRunner);
const payload: GetQuotaPlurimeRequestType = {
  sogeiCodPalinsesto: sogeicodpalinsesto,
  sogeiCodEvento: sogeicodevento,
  codiceScommessa: idScommessa,
  firstPosition: runner[0],
  secondPosition: runner[1],
  thirdPosition: accoppiataTrio.type === "trio" ? runner[2] : "0",
};