Stream transformer from async generator and options

Nodejs streams support generating a transform stream from an async generator function. As the docs state:

async generators are effectively a first-class language-level stream construct at this point¹

const tf = stream.Duplex.from(async function* (source) {
  for await (const chunk of source)
    yield chunk;
});

However, it appears to not support any options argument, in contrast to many other stream-construction methods. E.g. objectMode is apparently hardcoded to true², but similar issues arise for e.g. highWaterMark. The docs state:

Attempting to switch an existing stream into object mode is not safe³

(nothing about switching it off)

Therefore the missing options parameter is confusing to me.

Perhaps there are reasons, why such streams should always be in object-mode, but i don’t see them. Similar to e.g. readable streams, a transformer like this makes perfect sense to me (xor operation for demo purposes, imagine e.g. deflate):

const tf = stream.Duplex.from(async function* (source) {
  for await (const chunk of source) {
    for (let i = 0; i < chunk.length; i++) chunk[i] ^= 0x7C;
    yield chunk;
  }
});

I couldn’t find anything potentially difficult about adding an options parameter either. Therefore:

Is there a way to change options when creating streams this way?
(if not, why?)