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You should probably ask that in some Maven community? Afaik, no, but I'm by very far not a Maven expert or even regular as I try to not touch it with a five-foot pole if I can prevent it. 😄

No, Maven always checks each repository in order; there's no way to tell it that some repo won't have such dependency, or the reverse that some dependency is in a specific repo (or set of repos); and afaict, this is not planned either (Maven's stance is that you should use a repository manager, which will be able to codify such rules)