Expect is a Tcl extension. You can also put Tk in the mix if you want, to create graphical Expect-based applications. You might know Tk from Tkinter (a Python binding to Tk).

Undroidwish [0] is a Tcl/Tk binary that apparently has experimental support for Wayland (through SDL). It's a spin-off from Androwish [1], but more for desktop/embedded systems.

You might have something there, as Expect is supported for Androwish already.

[0] https://www.androwish.org/home/wiki?name=undroidwish

[1] https://www.androwish.org/