JSFiddle - React, Tailwind, and code Playground

JavaScript

const data = [
	[{ id : 1}, { id: 4 }],
  [{ id :2 }, { id : 3}]
]

const findIJ = ( data, id ) => 
  data.reduce( (p, c, i) => {
    let j = data[i].findIndex( x => x.id === id );
    if( j > - 1){
    	return { i, j }
    }
    return p;
  }, { i : -1, j : -1 });
  
  
console.log( findIJ( data, 1 ) );
console.log( findIJ( data, 3 ) );
console.log( findIJ( data, 5 ) );