Is there any way we can use a dictionary item to define an image href while editing a page?

I have an image that on clicking opens an external page. This external page has its url defined in a dictionary item.

When editing the page with a rte I can't insert a dictionary item or even a macro inside the href attribute. Umbraco garbles up the text...

Anyway we can do this? In desperation, I could use Javascript to replace the href attribute. But this would be really undesired...

Thanks.