A Hong Kong Chart of Accounts + Localisation is currently being developed for 8.0 here:
https://github.com/browseinfo/l10n_hk
You can track it's progress in the above repo, however it's still a work in progress.
In the meantime you can check submissions from Amit and Yoshi on the accounting mailing list here:
Accounting & Finance mailing list:
https://www.odoo.com/groups
There has been discussion in regards to setting up Hong Kong localisation including the COA:
https://www.odoo.com/groups/community-accounting-and-finance-61/community-accounting-and-finance-13003372?mode=thread&date_begin=&date_end=
In the above community mailing list thread there is a few examples submitted from Amit and Yoshi that may help with your own Hong Kong COA setup in the meantime.
Be aware: https://www.odoo.com/forum/help-1/question/8-0-severe-issue-constraint-error-when-creating-chart-of-accounts-from-self-defined-account-templates-69497