Although the Hong Kong property income is taxable in Hong Kong, when you are tax resident in the UK, it is also taxable here.
You would need to check if split year treatment applies.
If it does, you would declare the income from the date you are tax resident.
If you do not qualify for split year treatment, you would need to declare the overseas property income from 6 April 2022 and in both cases, claim a Foreign Tax Credit for the overseas tax paid.
RDR3 Statutory Residence Test