Describe layout for Picklist values based on Record type

IdeaDescribeLayout

<apex:page >
    <apex:includescript value="/soap/ajax/20.0/connection.js"/>
    <apex:includescript value="/soap/ajax/24.0/apex.js"/>
    <apex:includeScript value="https://code.jquery.com/jquery-2.2.1.min.js" />
    
    <script>
        
        sforce.connection.sessionId = '{!$Api.Session_ID}';
        var layout, recordTypeMap;
        FinalResult = new Array();
        layout = sforce.connection.describeLayout('Idea', new Array());
        recordTypeMap = layout.recordTypeMappings;
        
        //To remove the extra record type mapping for Master, not useful for usual case.
        recordTypeMap.pop();
        
        console.log('record type mappings:', recordTypeMap);
    
        recordTypeMap.forEach(function(obj){
            var recordTypeObj = {};
            recordTypeObj.name = obj.name.substring(0,obj.name.indexOf(':'));
            
            obj.picklistsForRecordType.forEach(function(pl){
                
                recordTypeObj[pl.picklistName] = pl.picklistValues;
            
            });
            console.log(recordTypeObj);
            FinalResult.push(recordTypeObj);
        });

        console.log('-----FinalResult', FinalResult);
        
    </script>
</apex:page>