Viewport Meta Statement

I have a number of Excel spreadsheets that I publish on the web weekly.  We are now looking to make them mobile friendly and have to add this statement:

<meta name="viewport" content="width=device-width, initial-scale=1.0">

I can add it manually but would like to have this meta statement added automatically with all the other meta statements that are included when I save the document as html.

Can this be accomplished? If so, how.

Thanks,

Paul