By retrieving data from WSD HK drinking water quality report (HKDWS)
>> 2019-2020 here 
pH 7.2-9.2, typical 8.3
Total hardness: aka GH total. Ca and Mg concentration
Total alkalinity: aka KH total. Index of the capacity of water to neutralize acidity. Also known as carbonate hardness
NB: sodium is missing, and so take it as zero mg/L. WHO mentioned typical is less than 20 mg/L.
Btw, water softener add ~8mg/L sodium
Brewersfriend Record no: 9SV4ZG2
From brewers friend calculator,
Input data to brewer friend as below:
Output:
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