Rating (type:'rating')

Source code: Survey setup
Survey.defaultBootstrapCss.navigationButton = "btn btn-primary";
Survey.Survey.cssType = "bootstrap";
var survey = new Survey.Model({questions:[    
    { type: "rating", name: "satisfaction", title: "How satisfied are you with the Product?", 
        mininumRateDescription: "Not Satisfied", maximumRateDescription: "Completely satisfied" }]
});

function onAngularComponentInit() {
    Survey.SurveyNG.render("surveyElement", {model:survey});
}
var HelloApp =
    ng.core
        .Component({
            selector: 'ng-app',
            template: '<div id="surveyContainer" class="survey-container contentcontainer codecontainer">' +
            '<div id="surveyElement"></div></div>'
        })
        .Class({
            constructor: function() {
            },
            ngOnInit: function() {
                onAngularComponentInit();
            }
        });
document.addEventListener('DOMContentLoaded', function() {
    ng.platformBrowserDynamic.bootstrap(HelloApp);
});

Minimum Rate Description: (default is empty)

var q = survey.getQuestionByName('satisfaction');
q.mininumRateDescription = yourvalue;
survey.render();

Maximum Rate Description: (default is empty) .

var q = survey.getQuestionByName('satisfaction');
q.maximumRateDescription = yourvalue;
survey.render();

Rate values: (default is empty)

var q = survey.getQuestionByName('satisfaction');
q.rateValues = yourvalue;
survey.render();