tl;dr: There are "96 bags of poop, pee, and puke" on the Moon already!
The bags of waste are ecosystems for sure, but like the ones you mentioned, they are not going to remain alive for very long
edit: ...or even potentially viable if brought in from the cold and incubated. Huge monthly thermal swings between say roughly +120°C and -120°C (see here and here for example) will render all except the heartiest extremophile spores nonviable. (see answers here and here)
For those extreme spores that somehow snuck aboard Chang-e 4 or the Apollo astronauts' digestive track, the lack of a lunar atmosphere will expose their DNA to cosmic radiation, and while the UV may be absorbed protons and to some extent neutrons and gamma rays from the surface will hopefully slow-roast their DNA to non-viability in short order.
From Gizmodo's There's Poop on the Moon:
There is, however, scientific value to the things left behind. Astrobiologists, for instance, hope to one day inspect that half-century-old feces to see if the crap has undergone any genetic mutations while in space. Even more mundane gear on the moon's surface offer a unique perspective on how different materials hold up in extreme environments like the moon, where temperatures oscillate between minus 370-degrees to 250-degrees Fahrenheit.
What kinds of mundane gear, you wonder? Well, there's actually an entire website devoted to trash on the moon. However, here's a list of the more interesting and unusual items—aside from the 96 bags of poop, pee, and puke:
- More than 70 spacecraft
- 5 American flags, all of which are now white
- 12 pairs of boots
- An olive branch sculpture made of gold:
- "Several improvised javelins"
- Used wet wipes
- Space food wrappers
- 2 golf balls
- This gold-plated telescope that was the first tool used to make astronomical observations from the surface of another planetary body:
- A feather from Baggin, the official mascot of Air Force Academy
- A patch from the doomed Apollo 1 mission that never launched
- This silicon disc with goodwill messages from 73 world leaders:
- 12 Hasselbad cameras
- This photograph of Astronaut Charlie Duke's family from Apollo 16:
- Not to be repetitive or anything: 96 bags of poop, pee, and puke