Bundles developer preview not showing

Hello, I’m currently researching Shopify bundles, and found out about the “Cart Transform API”. However, it seems that to use the API, I need to have bundle developer preview available (as in the docs stated), which I don’t. I have checked all my development stores, there is no bundle developer preview, I even create a new store and it’s still not showing.
I also found a google forms provided by Shopify: https://docs.google.com/forms/d/1IG4k83GxqPMcD7R7BQ9XRQGdUn4DjPay5Xfj9L4HA4w
But still no reply after weeks. My question is has anyone tried to implement this features? I want to further make progress on this new bundle features, but it seems so hard and confusing for me.

I know this API has gone through some changes while in dev preview. You might see if there is any relevant info here:
https://github.com/Shopify/function-examples/discussions/categories/feedback-cart-transform-api

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