Feature Request: support place plantuml code in <div hidden> </div>

[kcmvp]

In most case we just want to display the diagram instead of the palntuml code.
hopes to support place plantuml code in

[dios-david]

This would be really awesome, what I do now as a workaround is:

Text text text

![](./image-name.svg)
 
<details>
<summary>Code</summary>
 
 ```plantuml:image-name
        -- plantuml code here --
 ```

</details\>
</code\>

This will render the generated image, and a collapsed block below that with the title of "Code", which shows the original plantuml code when it's opened.