Japan - onshore mainland - EPSG:6697

WKT

HVCOORDSYS["HVC_JGD2011_and_JGD2011_vertical_height", 
	GEOGCS["GCS_JGD_2011", 
		DATUM["D_JGD_2011", 
			SPHEROID["GRS_1980", 6378137.0, 298.257222101]], 
		PRIMEM["Greenwich", 0.0], 
		UNIT["Degree", 0.0174532925199433]], 
	VERTCS["JGD2011_vertical_height", 
		VDATUM["Japanese_Geodetic_Datum_2011_vertical"], 
		PARAMETER["Vertical_Shift", 0.0], 
		PARAMETER["Direction", 1.0], 
		UNIT["Meter", 1.0]]]

WKT2

COMPOUNDCRS["HVC_JGD2011_and_JGD2011_vertical_height", 
	GEOGCRS["GCS_JGD_2011", 
		DATUM["D_JGD_2011", 
			ELLIPSOID["GRS_1980", 6378137.0, 298.257222101]], 
		PRIMEM["Greenwich", 0.0], 
		CS[ellipsoidal, 2], 
		AXIS["Latitude (lat)", north, 
			ORDER[1]], 
		AXIS["Longitude (lon)", east, 
			ORDER[2]], 
		ANGLEUNIT["Degree", 0.0174532925199433]], 
	VERTCRS["JGD2011_vertical_height", 
		VDATUM["Japanese_Geodetic_Datum_2011_vertical"], 
		CS[vertical, 1], 
		AXIS["Gravity-related height (H)", up, 
			LENGTHUNIT["Meter", 1.0]]], 
	ID["EPSG", "6697"]]

Data from @esri/proj-codes

{
  "wkid": 6697,
  "latestWkid": 6697,
  "pcsWkid": 0,
  "gcsWkid": 6668,
  "vcsWkid": 6695,
  "macro": "PE_HVC_JGD2011_JGD2011_VERT_HT",
  "name": "HVC_JGD2011_and_JGD2011_vertical_height",
  "wkt": "HVCOORDSYS[\"HVC_JGD2011_and_JGD2011_vertical_height\",GEOGCS[\"GCS_JGD_2011\",DATUM[\"D_JGD_2011\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],VERTCS[\"JGD2011_vertical_height\",VDATUM[\"Japanese_Geodetic_Datum_2011_vertical\"],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Meter\",1.0]]]",
  "wkt2": "COMPOUNDCRS[\"HVC_JGD2011_and_JGD2011_vertical_height\",GEOGCRS[\"GCS_JGD_2011\",DATUM[\"D_JGD_2011\",ELLIPSOID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],CS[ellipsoidal,2],AXIS[\"Latitude (lat)\",north,ORDER[1]],AXIS[\"Longitude (lon)\",east,ORDER[2]],ANGLEUNIT[\"Degree\",0.0174532925199433]],VERTCRS[\"JGD2011_vertical_height\",VDATUM[\"Japanese_Geodetic_Datum_2011_vertical\"],CS[vertical,1],AXIS[\"Gravity-related height (H)\",up,LENGTHUNIT[\"Meter\",1.0]]],ID[\"EPSG\",\"6697\"]]",
  "description": "Japan - onshore mainland",
  "authority": "EPSG",
  "version": "8.4(10.8.0)",
  "deprecated": "no",
  "areaname": "Japan - onshore mainland",
  "extent": {
    "slat": 30.94,
    "nlat": 45.54,
    "llon": 129.3,
    "rlon": 145.87
  }
}