I'm using the c# library for the ET SOAP API and I'm trying to assign a campaign ID to email templates. However, this doesn't appear to be possible. Going by this documentation, I don't see a property to set that would associate a campaign. Are there any workarounds to this limitation? Campaigns can be associated to email content in the Marketing Cloud UI, so I assumed there would be a way to do so via the API.
I do see that I can assign a campaign to an email send definition through the 'additional' property. So I'm guessing that's all that matters in terms of campaign associations?