Equivalent of Campaign Merge field for HTTP Post?

We send text messages from a campaign using an HTTPS post. We’d like to be able to set the text of the message as a parameter for the campaign, using something like a Campaign merge field (Campaign Merge Fields | Max Classic ).

However the HTTPS post configuration doesn’t give the option of Campaign merge fields, and entering ~Campaign.MergeFieldName~ doesn’t work either.

What could we use as a configurable field - that’s not specific to a contact - instead?

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still no news on this point?
This is something that would be very useful to use to manage Variables.