Those little square modules are just USB-C ports, I believe, so jamming an RTL-SDR dongle inside a 3D-printed case shouldn't be a monumental task.

But why? Putting a SDR in a laptop seems counterproductive from an electrical and radio interference POV. The USB2/3 ports are the option to plug in a software defined radio. Unless you mean some pcie interface top end SDR, in which case you probably have the money to throw around to get this custom.