Apple has been working for the past few years on developing a custom low-power Bluetooth radio chip for wireless earbuds, according to a new report in Forbes. The report notes that Apple could launch a set of Bluetooth earbuds as soon as September alongside the new iPhone model, which is expected to omit the 3.5mm headphone jack found on prior models. Recent leaks have suggested that Apple will bundle either Lightning EarPods or a Lightning audio…