One Tree Point - EPSG:5767

WKT

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

WKT2

VERTCRS["One_Tree_Point", 
	VDATUM["One_Tree_Point"], 
	CS[vertical, 1], 
	AXIS["Gravity-related height (H)", up, 
		LENGTHUNIT["Meter", 1.0]], 
	ID["EPSG", "5767"]]

Data from @esri/proj-codes

{
  "wkid": 5767,
  "latestWkid": 5767,
  "macro": "PE_VCS_ONE_TREE_POINT",
  "name": "One_Tree_Point",
  "wkt": "VERTCS[\"One_Tree_Point\",VDATUM[\"One_Tree_Point\"],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "VERTCRS[\"One_Tree_Point\",VDATUM[\"One_Tree_Point\"],CS[vertical,1],AXIS[\"Gravity-related height (H)\",up,LENGTHUNIT[\"Meter\",1.0]],ID[\"EPSG\",\"5767\"]]",
  "description": "One Tree Point",
  "authority": "EPSG",
  "version": "6.15(9.3.0.0)",
  "deprecated": "no",
  "areaname": "New Zealand - North Island - One Tree vcrs",
  "extent": {
    "slat": -36.41,
    "nlat": -34.36,
    "llon": 172.61,
    "rlon": 174.83
  }
}