You (probably) don't need to. Hue bulbs are repeaters, so unless they're all extremely far away from each other or the Bridge, you likely won't need to do anything special. As stated above, this is a separate Zigbee network from Hubitat, and devices on one won't repeat for the other, but I don't think this specific point was clarified. To be extra clear about your other question as well, keeping bulbs on their own Zigbee network (Hue is fantastic for this, though some adventerous individuals have also experimented with a second, dedicated Hubitat hub) is better than mixing them with other Zigbee devices for reasons mentioned above as well.
And to be super-clear about a third point, the channel advice above is good, but keep in mind that Wi-Fi and Zigbee use separate channel numbers, so you'll have to compare the actual frequencies orlook at a graph to see how they line up. Also, keep in mind that you will often see Zigbee channel numbers in hex (if they're nice, this will be clear and start with "0x" or be indicated elsewhere) rather than decimal, so you may also need to convert there (e.g., 14 in hex or 0x14 = channel 20 in decimal). Hubitat shows you both, but I think third-party software like XCTU might just use hex.