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No, it is impossible, no matter what mod you use. ActiveFormspecs probably makes it simpler to use (I haven't looked much, I prefer the raw stuff), but the engine limitation remains.
When you show a form usingyou pass a "name" for the form (which is also passed to your formspec handler callback if you want to respond to e.g. button clicks in the form). If you later show another form with the same name (and to the same player), this will replace the previous form without the player needing to re-load the form (i.e. it will immediately update what the player sees). So all you need to do is re-generate the entire form with the new text in response to whatever event triggered the change, and then show this to the player as you normally would.
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