contentControlCreate.js

// Run a batch operation against the Word object model.
Word.run(function (context) {
    
    // Create a proxy range object for the current selection.
    var range = context.document.getSelection();
    
    // Queue a commmand to create the content control.
    var myContentControl = range.insertContentControl();
    myContentControl.tag = 'Customer-Address';
    myContentControl.title = 'Enter Customer Address Here:';
    myContentControl.style = 'Heading 2';
    myContentControl.insertText('One Microsoft Way, Redmond, WA 98052', 'replace');
    myContentControl.cannotEdit = true;
    myContentControl.appearance = 'tags';
    
    // Queue a command to load the id property for the content control you created.
    context.load(myContentControl, 'id');
    
    // Synchronize the document state by executing the queued-up commands, 
    // and return a promise to indicate task completion.
    return context.sync().then(function () {
        console.log('Created content control with id: ' + myContentControl.id);
    });  
})
.catch(function (error) {
    console.log('Error: ' + JSON.stringify(error));
    if (error instanceof OfficeExtension.Error) {
        console.log('Debug info: ' + JSON.stringify(error.debugInfo));
    }
});