Can you use a Merge tag as a default for another Merge tag

Can you use a Merge tag as a default for another Merge tag

I'm trying to get Zoho to send an email with merge tags. One of these merge tags should select another merge tag as default. So for example I have the Mergetag: $[TITLE]$ and I want it to default to the Mergetag $[VV]$. Would that work? so the default value is: $[UD:TITLE|$[UD:VV]$|$[UD:VV]$]$.

Thanks in advance!