In the early 90s many countries started opening up pathways for HK citizens fearing this - there was a lot of talk of "Brain Drain" in HK.

Canada in particular did a great job of encouraging emigration.

These days it's a little harder. The classic "HK passport" is the BNO - British Nationality Overseas which doesn't give you right of abode in the UK because racism.

Asylum is also extremely difficult to achieve - you'd have to have been already targeted and by that point there's already a risk of being disappeared extra-judicially.