There is no Ergonomics safety job in SG as far as I know. Ergo is only part of health.
One of my lecturer in UNI who worked in SGH is an Ergo expert.
One of the ergo report may cost more than 10k. Seen his Ergo report when I was in a US MNC. Too bad I have read the report after I have completed that module.
EHS consists of Environmental, Health and Safety. Ones need lots of experience to be expert in one of these. I am only a generalist in EHS.