You can use STM32Cube to look at pin functions. Click on Timers then TIM1 on the left side.
You could use TIM1_CH1 and TIM1_CH1N, then you only need to set the Polarity and one will be inverted from the other or not.
Its also possible to just use another PWM channel, then set the settings for each one to be the same, other than Polarity, eg:
PA0 = TIM2_CH1. PA1, TIM2_CH2.