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JavaScript

//var m = {fn:"tom",ln:"miller"},{fn:"tom",ln:"miller"},{fn:"tom",ln:"miller"};

var original = [{"Member_Name":"MORGAN, KATHY","Member_ID":"308484402","Member_DOB":"03/05/1998","ProgramType":"Supportive","RateCode":"000603"},{"Member_Name":"BUDZYNSKI, ALDA","Member_ID":"C436418737","Member_DOB":"11/30/1998","ProgramType":"Supportive","RateCode":"000603"},{"Member_Name":"MALLARI, SCOTT","Member_ID":"705681684","Member_DOB":"08/20/2002","ProgramType":"Supportive","RateCode":""}]

let newData = {name:"John", address:"432 main st"}; 
//let newData = [{"name":"John", "address":"432 main st"}]; 

const arr = [];
arr.push(original)
arr.push(newData)

console.log(arr);