If it had several kilometer wide imaging array, then yes. Hubble and other telescopes are totally passive optics. You need to see the distant dot and have enoug

If it had several kilometer wide imaging array, then yes. Hubble and other telescopes are totally passive optics. You need to see the distant dot and have enough resolution to identify it as a telescope and see that it is pointing at you. Seeing hubble from more than 1 au would require optics about 8km in size. This doesn't need to be one giant mirror, could be two cameras 8km apart, but synchronized optically (distance known to a small part of wavelength of light). Seeing Hubble as more than 1 pixel to tell that it's a telescope pointing at you needs something much larger.