I don't know why, but I just keep trying just in case and now it works. Below is the code that made it function.

/**
 * Create a list.
 * @customfunction
 * @param name string
 * @param args {string[][]}
 */
function datatablex(display: string, ...args: string[][][]): any {
  const entity = {
    type: "Entity",
    text: display,
    properties: {
      Nombre: {
        type: "String",
        basicValue: display,
        propertyMetadata: {
          excludeFrom: {
            cardView: true
          }
        }
      }
    }
  };
  for (let i = 0; i < args[0].length; i += 2) {
    entity.properties[args[0][i + 0]] = {
      type: "Array", // "String",
      elements: args[0][i + 1] // basicValue: value
    };
  }
  return entity;
};