JSFiddle - React, Tailwind, and code Playground

JavaScript

const data = [
  'one', [
   {id: 1, value: 'A'},
   {id: 2, value: 'B'}
   ],
   'two', [
      {id: 3, value: 'C'},
      {id: 4, value: 'D'}
   ],
    'three', [
      {id: 5, value: 'E'},
      {id: 6, value: 'F'}
   ],
]


let myResult = [];
for (let i = 0; i < data.length; i++) {
 if (data[i] === 'two')
  myResult = data[i + 1];
}

console.log(myResult);