How to set outline of label viewport?

I’m finding way to set outline of label viewport in python code. I was looking in API of revit has method get outline of label viewport.

<span id=“nsrTitle”>"Viewport<span class=“languageSpecificText”><span class=“cs”>.</span><span class=“fs”>GetLabelOutLine </span></span>Method " , the problem is when we already GetLabelOutLine, how to set Outline for it ???</span>

Anyone has an idea ???