JSFiddle - React, Tailwind, and code Playground

JavaScript

var jsonData = [{"year":"1995","values":"46.8550182"},{"year":"1996","values":"47.1409752"},                   {"year":"1997","values":"46.6331669"},{"year":"1998","values":"46.3054604"}];

function format( jsonData ){
    return jsonData.map( function( item ){ return[ item.year, item.values] });
}

console.log( format( jsonData ) );