You can't do that. As you already know, ROMs are built for the specific hardware they run on. They have drivers and settings that only work on that hardware. The emulator only emulates a particular hardware configuration, and requires its own drivers for the emulated hardware.
To run a ROM file for a phone you'd need to change the emulator to emulate the specific hardware of that phone. This is next to impossible without the support of the device manufacturer, and would need to be repeated for each device. Alternatively, if you had the source of the ROM, you could change it to have the drivers and configuration for the emulator, but then it wouldn't be the production ROM any more.