Yellow Sea 1956 - EPSG:5736

WKT

VERTCS["Yellow_Sea_1956", 
	VDATUM["Yellow_Sea_1956"], 
	PARAMETER["Vertical_Shift", 0.0], 
	PARAMETER["Direction", 1.0], 
	UNIT["Meter", 1.0]]

WKT2

VERTCRS["Yellow_Sea_1956", 
	VDATUM["Yellow_Sea_1956"], 
	CS[vertical, 1], 
	AXIS["Gravity-related height (H)", up, 
		LENGTHUNIT["Meter", 1.0]], 
	ID["EPSG", "5736"]]

Data from @esri/proj-codes

{
  "wkid": 5736,
  "latestWkid": 5736,
  "macro": "PE_VCS_YELLOW_SEA_1956",
  "name": "Yellow_Sea_1956",
  "wkt": "VERTCS[\"Yellow_Sea_1956\",VDATUM[\"Yellow_Sea_1956\"],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "VERTCRS[\"Yellow_Sea_1956\",VDATUM[\"Yellow_Sea_1956\"],CS[vertical,1],AXIS[\"Gravity-related height (H)\",up,LENGTHUNIT[\"Meter\",1.0]],ID[\"EPSG\",\"5736\"]]",
  "description": "Yellow Sea 1956",
  "authority": "EPSG",
  "version": "6.15(9.3.0.0)",
  "deprecated": "no",
  "areaname": "China - onshore",
  "extent": {
    "slat": 18.11,
    "nlat": 53.56,
    "llon": 73.62,
    "rlon": 134.77
  }
}