As of Axure RP9, text fields can be styled like any other widget. Select the ‘Style’ tab in the right hand pane when you select the field.
Pop-out material design style labels like that can be achieved by adding a text widget with a white background and layering it over the field, then using Got Focus/Lost Focus actions to show or hide it. Note that there’s currently a bug that will make these repeatedly loop if grouped together.