Is there a way to attach stuff to "window.stuff" during SSR?

I'm wondering if it's possible to have the root route contain

<script>
window.__stuff__ = somethingWeOnlyKnowOnTheServer;
</script>

<script>
window.__stuff__ = somethingWeOnlyKnowOnTheServer;
</script>

Is this possible?

Is there a way to attach stuff to "window.__stuff__" during SSR? - TanStack