A DC-Return Plus a Bias-Tee can't be built-in to the exact same output concurrently. However, if a Bias-Tee is already there it could be converted to be a DC-Return, just by connecting the bias tee pin to floor by way of a 47 Ohm resistor (as The inner impedance from https://rf.vllis.com/en/product-category/broadband-amplifiers