Canada - EPSG:6649

WKT

HVCOORDSYS["HVC_NAD_1983_CSRS_and_CGVD2013_height", 
	GEOGCS["GCS_North_American_1983_CSRS", 
		DATUM["D_North_American_1983_CSRS", 
			SPHEROID["GRS_1980", 6378137.0, 298.257222101]], 
		PRIMEM["Greenwich", 0.0], 
		UNIT["Degree", 0.0174532925199433]], 
	VERTCS["CGVD2013_height", 
		VDATUM["Canadian_Geodetic_Vertical_Datum_of_2013"], 
		PARAMETER["Vertical_Shift", 0.0], 
		PARAMETER["Direction", 1.0], 
		UNIT["Meter", 1.0]]]

WKT2

COMPOUNDCRS["HVC_NAD_1983_CSRS_and_CGVD2013_height", 
	GEOGCRS["GCS_North_American_1983_CSRS", 
		DATUM["D_North_American_1983_CSRS", 
			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["CGVD2013_height", 
		VDATUM["Canadian_Geodetic_Vertical_Datum_of_2013"], 
		CS[vertical, 1], 
		AXIS["Gravity-related height (H)", up, 
			LENGTHUNIT["Meter", 1.0]]], 
	ID["EPSG", "6649"]]

Data from @esri/proj-codes

{
  "wkid": 6649,
  "latestWkid": 6649,
  "pcsWkid": 0,
  "gcsWkid": 4617,
  "vcsWkid": 6647,
  "macro": "PE_HVC_NAD_1983_CSRS_CGVD2013_HT",
  "name": "HVC_NAD_1983_CSRS_and_CGVD2013_height",
  "wkt": "HVCOORDSYS[\"HVC_NAD_1983_CSRS_and_CGVD2013_height\",GEOGCS[\"GCS_North_American_1983_CSRS\",DATUM[\"D_North_American_1983_CSRS\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],VERTCS[\"CGVD2013_height\",VDATUM[\"Canadian_Geodetic_Vertical_Datum_of_2013\"],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Meter\",1.0]]]",
  "wkt2": "COMPOUNDCRS[\"HVC_NAD_1983_CSRS_and_CGVD2013_height\",GEOGCRS[\"GCS_North_American_1983_CSRS\",DATUM[\"D_North_American_1983_CSRS\",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[\"CGVD2013_height\",VDATUM[\"Canadian_Geodetic_Vertical_Datum_of_2013\"],CS[vertical,1],AXIS[\"Gravity-related height (H)\",up,LENGTHUNIT[\"Meter\",1.0]]],ID[\"EPSG\",\"6649\"]]",
  "description": "Canada",
  "authority": "EPSG",
  "version": "8.3.3(10.8.0)",
  "deprecated": "no",
  "areaname": "Canada",
  "extent": {
    "slat": 38.21,
    "nlat": 86.46,
    "llon": -141.01,
    "rlon": -40.73
  }
}