We don’t have to rely on polling as the 2019 district elections happened in HK that November and the message was extremely clear that the bulk of the population was pro-protestors and anti-the HK government: https://en.wikipedia.org/wiki/2019_Hong_Kong_local_elections

Nearly three million people voted, equivalent to 71 per cent of registered voters, an unprecedented turnout in the electoral history of Hong Kong. The election was widely viewed as a de facto referendum on the concurrent anti-extradition protests.[3]

All pro-Beijing parties suffered major setbacks and losses, including the flagship pro-Beijing party Democratic Alliance for the Betterment and Progress of Hong Kong (DAB), which received its largest defeat in history, losing 96 seats. Executive Councillor Regina Ip's New People's Party failed to obtain a single seat, and was ousted from all District Councils as a result.[4][5] Dozens of prominent pro-Beijing heavyweights lost their campaigns for re-election, including Junius Ho, a controversial anti-protest figure who had expressed support for the triads behind the mob attack in Yuen Long on 21 July.[4][5]

In contrast, the pro-democracy camp in conjunction with the localist camp achieved its biggest landslide victory in the history of Hong Kong, gaining absolute majority in votes and electoral seats in all of the 18 District Councils and tripling their seats from around 124 to about 388.