NGNC08 height - EPSG:9351

WKT

VERTCS["NGNC08_height", 
	VDATUM["Nivellement_General_de_Nouvelle_Caledonie_2008"], 
	PARAMETER["Vertical_Shift", 0.0], 
	PARAMETER["Direction", 1.0], 
	UNIT["Meter", 1.0]]

WKT2

VERTCRS["NGNC08_height", 
	VDATUM["Nivellement_General_de_Nouvelle_Caledonie_2008"], 
	CS[vertical, 1], 
	AXIS["Gravity-related height (H)", up, 
		LENGTHUNIT["Meter", 1.0]], 
	ID["EPSG", "9351"]]

Data from @esri/proj-codes

{
  "wkid": 9351,
  "latestWkid": 9351,
  "macro": "PE_VCS_NGNC08_HT",
  "name": "NGNC08_height",
  "wkt": "VERTCS[\"NGNC08_height\",VDATUM[\"Nivellement_General_de_Nouvelle_Caledonie_2008\"],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "VERTCRS[\"NGNC08_height\",VDATUM[\"Nivellement_General_de_Nouvelle_Caledonie_2008\"],CS[vertical,1],AXIS[\"Gravity-related height (H)\",up,LENGTHUNIT[\"Meter\",1.0]],ID[\"EPSG\",\"9351\"]]",
  "description": "NGNC08 height",
  "authority": "EPSG",
  "version": "9.8.11(12.7.0)",
  "deprecated": "no",
  "areaname": "New Caledonia - Belep, Grande Terre, Ile des Pins, Loyalty Islands",
  "extent": {
    "slat": -22.73,
    "nlat": -19.5,
    "llon": 163.54,
    "rlon": 168.19
  }
}