[TYPO3-mvc] How can I give content to a ViewHelper when using alternative syntax?

[Oliver Salzburg]

I'm working on a submit page for EXT:powermail. I want to put a link
under it, that links back to the page the user originally came from.

I'm passing the page ID through and put the following in my Submit page:

{f:link.page(pageUid:'{backto}')}

This will create the link just fine, but how can I give the link some
text? It has no content.

Worst of all, all content after this "marker" is included in the link.

What options do I have?