Flask WTForms Display Field Title In Button Only

I'm using the following WTForm class in my Flask app:

class CancelJob(Form):
    cancel_button = SubmitField('Cancel It!')
    jk_button = SubmitField('Just Kidding')

When rendered (using the render_field macro provided here) it looks like this:

What I can't figure out is how to make the text appear inside the button only (ie no title above the button).

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