TMS320F28335: pwm injection for quasi z source

Hello, I want to generate switching signals for a quasi-z source inverter using the svpwm method. I can generate the traditional svpwm method, but I couldn't add short-circuit time to it. Therefore, I want to use another method called pwm injection method. That is, I want to add pwm signals with different frequencies and duty cycles into the pwm signals I produce. I plan to do this by generating an additional pwm signal then with the or gate comparing the new pwm signal with the old ones before sending them to the drivers. My question is whether I can add an external pwm signal to the pwm signals without the need for a or gate, just through software.