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None is harmful, and none eats blueberries.
The first is Rivellia syngenesiae, whose larvae feed by nitrogene-fixing nodules on legumes.
The second is a Sepsis, whose larvae are predators on other insect lavae (usually in dung).

To my knowledge, there is no fruit flies feeding in the blueberry fruits in Europe.

According to Foote, Blanc and Norrbom (1993) in the USA and Canada, Rhagoletis mendax "has long been known to infest commercial plantings of blueberries, and no fewer than 11 additional species of Vaccinium have been recorded as hosts (Wasbauer 1972). Three species of Gaylussacia also are regarded as preferred hosts (Bush 1966a)."

No cases of its introduction to Europe, however, are known, on the contrary to the other Rhagoletis species, American Cherry fruit fly and the Walnut Husk fruitly, which are now widespread pests.