Programmatically set value to the Comment Input then Trigger click of Post button on Comment panel

Hello,

We want that whenever we highlighted text on the viewer, we will insert the copied text(+ some texts) to the comment input then automatically trigger the Post button. 

We can now get the highlighted text using AdobeDC.View.Enum.FilePreviewEvents.PREVIEW_SELECTION_END event but we still don't know how to put that value to the Comment input and trigger the Post button automatically.

Is there a a way to access the current Comment controls?

Thanks,