JGD 2011 Japan Zone 6 - EPSG:6674

WKT

PROJCS["JGD_2011_Japan_Zone_6", 
	GEOGCS["GCS_JGD_2011", 
		DATUM["D_JGD_2011", 
			SPHEROID["GRS_1980", 6378137.0, 298.257222101]], 
		PRIMEM["Greenwich", 0.0], 
		UNIT["Degree", 0.0174532925199433]], 
	PROJECTION["Transverse_Mercator"], 
	PARAMETER["False_Easting", 0.0], 
	PARAMETER["False_Northing", 0.0], 
	PARAMETER["Central_Meridian", 136.0], 
	PARAMETER["Scale_Factor", 0.9999], 
	PARAMETER["Latitude_Of_Origin", 36.0], 
	UNIT["Meter", 1.0]]

WKT2

PROJCRS["JGD_2011_Japan_Zone_6", 
	BASEGEOGCRS["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]], 
	CONVERSION["Transverse_Mercator", 
		METHOD["Transverse_Mercator"], 
		PARAMETER["False_Easting", 0.0], 
		PARAMETER["False_Northing", 0.0], 
		PARAMETER["Central_Meridian", 136.0], 
		PARAMETER["Scale_Factor", 0.9999], 
		PARAMETER["Latitude_Of_Origin", 36.0]], 
	CS[Cartesian, 2], 
	AXIS["Northing (Y)", north, 
		ORDER[1]], 
	AXIS["Easting (X)", east, 
		ORDER[2]], 
	LENGTHUNIT["Meter", 1.0], 
	ID["EPSG", "6674"]]

Data from @esri/proj-codes

{
  "wkid": 6674,
  "latestWkid": 6674,
  "gcsWkid": 6668,
  "macro": "PE_PCS_JGD_2011_JAPAN_6",
  "name": "JGD_2011_Japan_Zone_6",
  "wkt": "PROJCS[\"JGD_2011_Japan_Zone_6\",GEOGCS[\"GCS_JGD_2011\",DATUM[\"D_JGD_2011\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Transverse_Mercator\"],PARAMETER[\"False_Easting\",0.0],PARAMETER[\"False_Northing\",0.0],PARAMETER[\"Central_Meridian\",136.0],PARAMETER[\"Scale_Factor\",0.9999],PARAMETER[\"Latitude_Of_Origin\",36.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "PROJCRS[\"JGD_2011_Japan_Zone_6\",BASEGEOGCRS[\"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]],CONVERSION[\"Transverse_Mercator\",METHOD[\"Transverse_Mercator\"],PARAMETER[\"False_Easting\",0.0],PARAMETER[\"False_Northing\",0.0],PARAMETER[\"Central_Meridian\",136.0],PARAMETER[\"Scale_Factor\",0.9999],PARAMETER[\"Latitude_Of_Origin\",36.0]],CS[Cartesian,2],AXIS[\"Northing (Y)\",north,ORDER[1]],AXIS[\"Easting (X)\",east,ORDER[2]],LENGTHUNIT[\"Meter\",1.0],ID[\"EPSG\",\"6674\"]]",
  "description": "JGD 2011 Japan Zone  6",
  "authority": "EPSG",
  "version": "8.4(10.3.1)",
  "deprecated": "no",
  "areaname": "Japan - zone VI",
  "extent": {
    "slat": 33.4,
    "nlat": 36.33,
    "llon": 134.86,
    "rlon": 136.99
  }
}