Nope, you roll with iGPU.

I actually have the same igpu as is in 8700G in my laptop (ryzen 7840U), probably somewhat nerfed as it’s a mobile cpu. To be honest I did not expect that I will be playing Diablo 4 on it.

But sure, you can squeeze in a GPU if you cheap out on some other stuff or buy used parts. Like the laptop I mentioned above - used HP Elitebook for about €750. Hands down the cheapest a the best laptop I ever bought. And "unfortunately " far more gaming capable than I thought.