You need to buy a split adapter. One side is set for microphone, the other is set for audio. Plug that into your controller audio port. Then plug both headsets into the corresponding ports. And your good to go.
This adapter will do the job for you, but you'll need a mic level output to feed it.
VIA 15 Pro has a single Audio port with combined Headphone+Microphone function (like a smartphone headset).
Your Rode microphone needs a single Microphone input port.
You need to buy something like this:
https://www.amazon.com/UGREEN-Headphone-Microphone-Compatible-Controller/dp/B07MQZ255K/
To find more such offers, look for "CTIA splitter" and make sure to buy one with two female ports and one male plug, such as the one that I linked.
// Tom