How to intercept key presses in TextEdit?

[SneedSeedFeed]

I can only find information for LineEdit which already has what I want, other than being single line and no matter how I toy with FocusScope I can't seem to find something that works (although I am very new to slint).

Ideally I would like to achieve something like

        FocusScope {
            key_pressed(event) => {
                if (event.text == Key.Return && !event.modifiers.shift) {
                    send_message(new_message);
                    new_message = "";
                    EventResult.reject
                } else {
                    backend_key_press(event);
                    EventResult.accept
                }
            }
            HorizontalLayout {
                input := TextEdit {
                    width: 100%;
                    height: 100%;
                    placeholder-text: "lorem ipsum or smthn";
                    wrap: TextWrap.word-wrap;
                    text <=> new_message;
                }
            }
        }

So if someone hits enter and isn't holding shift we trigger the callback, otherwise we let it through and maybe do something else.