RGF93 v2 + NGF-IGN78 height - EPSG:9539

WKT

HVCOORDSYS["RGF93_v2_and_NGF-IGN78_height", 
	GEOGCS["RGF93_v2", 
		DATUM["Reseau_Geodesique_Francais_1993_v2", 
			SPHEROID["GRS_1980", 6378137.0, 298.257222101]], 
		PRIMEM["Greenwich", 0.0], 
		UNIT["Degree", 0.0174532925199433]], 
	VERTCS["NGF_IGN78", 
		VDATUM["Nivellement_General_de_la_France_IGN78"], 
		PARAMETER["Vertical_Shift", 0.0], 
		PARAMETER["Direction", 1.0], 
		UNIT["Meter", 1.0]]]

WKT2

COMPOUNDCRS["RGF93_v2_and_NGF-IGN78_height", 
	GEOGCRS["RGF93_v2", 
		DATUM["Reseau_Geodesique_Francais_1993_v2", 
			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["NGF_IGN78", 
		VDATUM["Nivellement_General_de_la_France_IGN78"], 
		CS[vertical, 1], 
		AXIS["Gravity-related height (H)", up, 
			LENGTHUNIT["Meter", 1.0]]], 
	ID["EPSG", "9539"]]

Data from @esri/proj-codes

{
  "wkid": 9539,
  "latestWkid": 9539,
  "pcsWkid": 0,
  "gcsWkid": 9777,
  "vcsWkid": 5721,
  "macro": "PE_HVC_RGF93_V2_NGF_IGN78_HEIGHT",
  "name": "RGF93_v2_and_NGF-IGN78_height",
  "wkt": "HVCOORDSYS[\"RGF93_v2_and_NGF-IGN78_height\",GEOGCS[\"RGF93_v2\",DATUM[\"Reseau_Geodesique_Francais_1993_v2\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],VERTCS[\"NGF_IGN78\",VDATUM[\"Nivellement_General_de_la_France_IGN78\"],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Meter\",1.0]]]",
  "wkt2": "COMPOUNDCRS[\"RGF93_v2_and_NGF-IGN78_height\",GEOGCRS[\"RGF93_v2\",DATUM[\"Reseau_Geodesique_Francais_1993_v2\",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[\"NGF_IGN78\",VDATUM[\"Nivellement_General_de_la_France_IGN78\"],CS[vertical,1],AXIS[\"Gravity-related height (H)\",up,LENGTHUNIT[\"Meter\",1.0]]],ID[\"EPSG\",\"9539\"]]",
  "description": "RGF93 v2 + NGF-IGN78 height",
  "authority": "EPSG",
  "version": "10.013(13.2.0)",
  "deprecated": "no",
  "areaname": "France - Corsica onshore",
  "extent": {
    "slat": 41.31,
    "nlat": 43.07,
    "llon": 8.5,
    "rlon": 9.63
  }
}