UTM fields Social Button setup

We want to create social share buttons with UTM tracking.

Ideally UTM parameters would be a standard part of setting up sharing buttons on Landing Pages.

When choosing what the Shared Post should link to it would be great to be able to define UTM tags within Marketo.

Alternatively a new Token for the current web page.

Then we would be able to select "External URL" in the above selection and create the URL with UTM by:

{{my.current-page-url}}{{my.utm-m-s}}{{my.utm-c}}