function getObjectFormat(title,childRows,key){
    var setKey = (key == null)?("childRows"):(key);
    return {
        title: title,
        [setKey]: childRows
    };
};

function createChildRows(array,childRows,key = null){
    var array = array.reverse();
    array = array.filter(function(n){return (n != undefined && n != "") });

    // Initial child rows
    var formate = getObjectFormat(array[0],childRows,key);
    for(var i = 1; i < (array.length); i++){
        formate = getObjectFormat(array[i],formate,key);
    };
    return formate;
};

// Demo call. Console the result of generated dynamic Json Objects

var array = ("test1|test2|test3|test4").split("|");

console.log(createChildRows(array,{"title":"Last Child Row"},"more"));