Power for power supply in trunk?

Hello! I’m a beginner. Maybe someone can tell me how to get power from the battery to the trunk in my Jetta2 for the power amplifier? However, I didn’t want to tear the whole cockpit apart if possible, because I need my car every day. Have already expanded what you just got out, but that wasn’t enough by far. The storage under the glove compartment went well, but the glove compartment itself didn’t let me expand so easily. There must be a hole somewhere else that I can get out of the engine room behind the car radio or something. Or I have to drive into the workshop. But that might cost money again. And if that’s a power amplifier value for me? Thank you. MfG: Joschkie