Dohwan C. I can address this bit:
7. from-template API roadmap
Currently supported parameters:
gammaId, prompt, themeId, exportAs, imageOptions
Are there plans to support additional parameters such as:
textMode, additionalInstructions, textOptions?
No current plans. We’re trying to move towards a world where generation is less constrained by discrete settings (that can conflict), and rely more on your prompt. This will help us as we move towards more agentic create experiences.
My recommendation would be to spend some time dialing in your prompt inside of the app with a template and testing different inputs, and then pull out more generic instructions as a pre-amble/add-on when you hit the API