LTF2004(G) 3D - EPSG:9546

WKT

GEOGCS["LTF2004(G)_3D", 
	DATUM["Lyon_Turin_Ferroviaire_2004", 
		SPHEROID["GRS_1980", 6378137.0, 298.257222101]], 
	PRIMEM["Greenwich", 0.0], 
	UNIT["Degree", 0.0174532925199433], 
	LINUNIT["Meter", 1.0]]

WKT2

GEOGCRS["LTF2004(G)_3D", 
	DATUM["Lyon_Turin_Ferroviaire_2004", 
		ELLIPSOID["GRS_1980", 6378137.0, 298.257222101]], 
	PRIMEM["Greenwich", 0.0], 
	CS[ellipsoidal, 3], 
	AXIS["Latitude (lat)", north, 
		ORDER[1], 
		ANGLEUNIT["Degree", 0.0174532925199433]], 
	AXIS["Longitude (lon)", east, 
		ORDER[2], 
		ANGLEUNIT["Degree", 0.0174532925199433]], 
	AXIS["Ellipsoidal height (h)", up, 
		ORDER[3], 
		LENGTHUNIT["Meter", 1.0]], 
	ID["EPSG", "9546"]]

Data from @esri/proj-codes

{
  "wkid": 9546,
  "latestWkid": 9546,
  "macro": "PE_GCS_LTF2004G_3D",
  "name": "LTF2004(G)_3D",
  "wkt": "GEOGCS[\"LTF2004(G)_3D\",DATUM[\"Lyon_Turin_Ferroviaire_2004\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433],LINUNIT[\"Meter\",1.0]]",
  "wkt2": "GEOGCRS[\"LTF2004(G)_3D\",DATUM[\"Lyon_Turin_Ferroviaire_2004\",ELLIPSOID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],CS[ellipsoidal,3],AXIS[\"Latitude (lat)\",north,ORDER[1],ANGLEUNIT[\"Degree\",0.0174532925199433]],AXIS[\"Longitude (lon)\",east,ORDER[2],ANGLEUNIT[\"Degree\",0.0174532925199433]],AXIS[\"Ellipsoidal height (h)\",up,ORDER[3],LENGTHUNIT[\"Meter\",1.0]],ID[\"EPSG\",\"9546\"]]",
  "description": "LTF2004(G) 3D",
  "authority": "EPSG",
  "version": "10.009(12.8.0)",
  "deprecated": "no",
  "areaname": "Europe - Lyon-Turin",
  "extent": {
    "slat": 44.87,
    "nlat": 45.89,
    "llon": 4.65,
    "rlon": 7.88
  }
}