Does fetch support piping body into request?

Hello,
I'm trying to create proxy which pass all incoming data into fetch request to an another server, but every try causes error/no success.
Could someone help me?
I'm trying do something like that:

router.post('/test', async (req, res) => {
        var r = new stream.PassThrough();
        req.pipe(r);
        await fetch('http://some-url', {
            body: stream.Readable.from(r),
            method: 'POST',
            headers: req.headers,
        });
        res.sendStatus(202);
    });

or

router.post('/test', async (req, res) => {
        await fetch('http://some-url', {
            body: req,
            method: 'POST',
            headers: req.headers,
        });
        res.sendStatus(202);
    });

I need to achieve the same result, as old lib does: https://www.npmjs.com/package/request#streaming

I'm using node 18 and embedded fetch method.

Thanks in advance.
Regards

Start by reproducing both proxy examples with Node 18's embedded fetch, using the request body streams and headers shown in the issue. Determine whether streaming request bodies are supported; done means establishing the supported behavior and documenting or implementing the required piping behavior.