Allow children to return HTML

I'm trying to generate RSS feed using `reactElementToJSXString` from a React element.

When I try to render the content of the blog post, it should look something like this:

```xml

my para

]]>

```

However, it seems like all the HTML is transformed into a string:

```xml

{`

my para

]]>`}

```

My React code:

```ts
import type { JSONFeed } from "./feed-type";

export const RSS = (feed: JSONFeed) => (


{feed.items?.map((item) => {
return (

{``}

);
})}


);
```

Is it possible to have it rendered without being turned into a string?

Start by reproducing the RSS example with reactElementToJSXString and inspect how child text containing HTML and CDATA is serialized. Determine the expected output for HTML children and verify the behavior with a focused regression test; done means the generated JSX preserves the requested child representation without the current string transformation.

Written by the indexing model from the issue text.