Hi Felipe!
Great to hear you've found Transparency.js suitable for your needs!
At the moment, there's no functionality to reconstruct the rendered object from template. With forms, I've used either jQuery functions or Spine.Model.fromForm() [1].
However, such a feature shouldn't be too hard to implement, in case there's a use case and some community support for the feature. Could you describe the use case with example api calls, input data and output data as a GitHub issue?
Best Regards,
Jarno