I think it's supposed to be a vent for the leech field. See https://septicpatrol.com/does-a-leach-field-need-to-be-vented/
this post was submitted on 02 Aug 2023
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I'd take a trip to the local septic permitting agency and see if I could get copies of the permit and approved septic system design/as-built site plans. The inspector will probably be able to tell you if you need it or not.
It might be a vent for the leach field although that's not common where I'm from. I guess it could also be a marker for a distribution box or some other system component.
technically it's your lawn, you can do whatever you'd like to it.
the real question is should you