Figma embed parameters?

Our team is using Figma embeds in our documentation site to show live previews of our design components. Whenever possible, we’d like to display these previews at 100% scale. Looks like Figma tries to scale embedded frames to fit in the iframe (a good default!) but I’m wondering if there are url params that we can use to control the scaling behavior, similar to those used in Figma prototype share links?

Additionally, it would be INCREDIBLY useful if the embedded Figma iframe could post a message to the parent window when it loads and include the native (100% scaled) width and height of the frame. That way, the host page could optionally use that information to resize the iframe to accommodate the Figma content.

Please consider!