In Jainism, there is no canonical doctrine about earthly “aliens” or extraterrestrial civilizations visiting Earth. Here is the Jain perspective in brief:

• Jivas (souls) are countless and inhabit many lokas (worlds) in the Jain cosmos. Some are in earthly realms, some in celestial (deva) realms, and others in hellish or other spheres. The cosmology describes an infinite universe with many kinds of beings, but it does not discuss humanlike alien civilizations visiting Earth.
• The focus of Jain teaching is on karma, liberation (moksha), right conduct (anga), and the purification of the soul. The scriptures address how any jiva, regardless of form or realm, can attain liberation through right knowledge, right faith, and right conduct.
• Non-human beings in Jain texts include various celestial beings, yakshas, nagas, and other beings, but these are described within the Jain moral and cosmological framework rather than as “aliens” from another planet.
• Digambar and Śvetāmbar traditions share the same basic cosmology and emphasis on liberation; differences between them do not introduce a separate doctrine about extraterrestrial life. The core idea remains: any jiva can progress toward omniscience if karma is burned away.

If you’d like, I can point you to specific Jain texts or sections that outline the Jain cosmology and the variety of beings within it.