Yes, it is doable. While MCUXpresso IDE is primarily designed for the GNU toolchain, NXP provides a GHS (Green Hills Software) project export feature within the SDK.
To do this, you must first go to the NXP SDK Builder and specifically select the "Green Hills" toolchain option when building/downloading your SDK for the i.MX RT1170. Once downloaded, you can import the SDK into MCUXpresso IDE. To generate the GHS-specific project files, you would typically use the "Export" wizard or use the standalone Project Generator tool found within the SDK's tools folder to create the .gpj files required for the Green Hills MULTI IDE.