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Magic jar has a duration of "Until dispelled", but dispel magic targets...
one object, creature, or magic effect within range
Magic jar involves multiple things (a container, yourself, a creature, both souls) but it's unclear to me what the spell is technically "on" (emphasis below is mine)
Any spell of 3rd level or lower on the target ends
What exactly do you have to target to dispel magic jar with dispel magic?
The target of magic jar is always in the jar or possessing a body. Wherever that is should be the target for dispel magic.
In the description of the spell, the target of the spell is referred to as "you". Wherever that "you" is, is where the target of magic jar is, and should be the target of dispel magic.
The "you" is in the container.
Your body falls into a catatonic state as your soul leaves it and enters the container you used for the spell's material component... The only action you can take is to project your soul up to 100 feet out of the container, either returning to your living body (and ending the spell) or attempting to possess a humanoids body.
The "you" is in the host body.
While possessing a body, you can use your action to return from the host body to the container if it is within 100 feet of you, returning the host creature's soul to its body
There are 3 things you could conceivably dispel dispel.
If you dispel the caster and succeed the spell ends, the container is destroyed and the casters soul attempts to return to their body.
If you dispel a possessed target then the casters soul is ejected and returns to the container if it is able.
It is unclear if the container is a valid target for dispel magic and what the magical effect on it is. It may function as a possessed object or as a creation of the spell itself.
Is the magical effect its ability to hold souls?
Since the jar is destroyed when the spell ends it seems the jar is transformed into a new magical object by the spell (a soul container). If this is the case then when dispelled the container would lose its ability to hold souls and be functionally destroyed. Ending the spell, possibly without the container physically being destroyed because the effect that would have destroyed it was dispelled.
If this was meant to have been the case the spell really should have said that it created a magical soul container. Making it unambiguous that the container was a magical effect and could be dispelled, destroying it. Instead it is just hinted to be the case.
Is the magical effect the specific soul inside it?
Another option is that the jar itself is non magical and that the magical effect is the specific soul in the jar. In if the jar or the soul is dispelled then which ever soul is in there returns to their body. If it is the casters the spell ends, if it is a victims then they return to their body and the casters soul returns to the container if it is able.
