How can I show a Slot/Fill in the block editor

By wrapping everything in a <SlotFillProvider> and rendering MyTestFill it works, here is the code:

const { Fill, Slot } = createSlotFill( 'MyFill' );
const TestFill = () => <Fill>My item in the editor</Fill>;

export default function Edit() {
    return (
        <p { ...useBlockProps() }>
            <SlotFillProvider>
                <Slot />
                { __( 'Fill Test – hello from the editor!', 'fill-test' ) }
                <TestFill />
            </SlotFillProvider>
        </p>
    );
}