Np, you are correct F070 does have one: https://www.st.com/resource/en/datasheet/stm32f070c6.pdf
You can give it a try: stm32: f070 add PA9/PA10 i2c bus line by nefelim4ag · Pull Request #7039 · Klipper3d/klipper · GitHub
This could help with testing: Testing Klipper Pull Requests