GDM2008 LGM2012 - ESRI:103872

WKT

PROJCS["GDM2008_LGM2012", 
	GEOGCS["GDM2008", 
		DATUM["Geocentric_Datum_of_Mauritius_2008", 
			SPHEROID["GRS_1980", 6378137.0, 298.257222101]], 
		PRIMEM["Greenwich", 0.0], 
		UNIT["Degree", 0.0174532925199433]], 
	PROJECTION["Lambert_Conformal_Conic"], 
	PARAMETER["False_Easting", 250000.0], 
	PARAMETER["False_Northing", 350000.0], 
	PARAMETER["Central_Meridian", 57.56455662222222], 
	PARAMETER["Standard_Parallel_1", -20.06111111111111], 
	PARAMETER["Standard_Parallel_2", -20.44444444444445], 
	PARAMETER["Latitude_Of_Origin", -20.2755163], 
	UNIT["Meter", 1.0]]

WKT2

PROJCRS["GDM2008_LGM2012", 
	BASEGEOGCRS["GDM2008", 
		DATUM["Geocentric_Datum_of_Mauritius_2008", 
			ELLIPSOID["GRS_1980", 6378137.0, 298.257222101]], 
		PRIMEM["Greenwich", 0.0], 
		CS[ellipsoidal, 2], 
		AXIS["Longitude (lon)", east, 
			ORDER[1]], 
		AXIS["Latitude (lat)", north, 
			ORDER[2]], 
		ANGLEUNIT["Degree", 0.0174532925199433]], 
	CONVERSION["Lambert_Conformal_Conic", 
		METHOD["Lambert_Conformal_Conic"], 
		PARAMETER["False_Easting", 250000.0], 
		PARAMETER["False_Northing", 350000.0], 
		PARAMETER["Central_Meridian", 57.56455662222222], 
		PARAMETER["Standard_Parallel_1", -20.06111111111111], 
		PARAMETER["Standard_Parallel_2", -20.44444444444445], 
		PARAMETER["Latitude_Of_Origin", -20.2755163]], 
	CS[Cartesian, 2], 
	AXIS["Easting (X)", east, 
		ORDER[1]], 
	AXIS["Northing (Y)", north, 
		ORDER[2]], 
	LENGTHUNIT["Meter", 1.0], 
	ID["Esri", "103872"]]

Data from @esri/proj-codes

{
  "wkid": 103872,
  "latestWkid": 103872,
  "gcsWkid": 104028,
  "macro": "PE_PCS_GDM2008_LGM2012",
  "name": "GDM2008_LGM2012",
  "wkt": "PROJCS[\"GDM2008_LGM2012\",GEOGCS[\"GDM2008\",DATUM[\"Geocentric_Datum_of_Mauritius_2008\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Lambert_Conformal_Conic\"],PARAMETER[\"False_Easting\",250000.0],PARAMETER[\"False_Northing\",350000.0],PARAMETER[\"Central_Meridian\",57.56455662222222],PARAMETER[\"Standard_Parallel_1\",-20.06111111111111],PARAMETER[\"Standard_Parallel_2\",-20.44444444444445],PARAMETER[\"Latitude_Of_Origin\",-20.2755163],UNIT[\"Meter\",1.0]]",
  "wkt2": "PROJCRS[\"GDM2008_LGM2012\",BASEGEOGCRS[\"GDM2008\",DATUM[\"Geocentric_Datum_of_Mauritius_2008\",ELLIPSOID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],CS[ellipsoidal,2],AXIS[\"Longitude (lon)\",east,ORDER[1]],AXIS[\"Latitude (lat)\",north,ORDER[2]],ANGLEUNIT[\"Degree\",0.0174532925199433]],CONVERSION[\"Lambert_Conformal_Conic\",METHOD[\"Lambert_Conformal_Conic\"],PARAMETER[\"False_Easting\",250000.0],PARAMETER[\"False_Northing\",350000.0],PARAMETER[\"Central_Meridian\",57.56455662222222],PARAMETER[\"Standard_Parallel_1\",-20.06111111111111],PARAMETER[\"Standard_Parallel_2\",-20.44444444444445],PARAMETER[\"Latitude_Of_Origin\",-20.2755163]],CS[Cartesian,2],AXIS[\"Easting (X)\",east,ORDER[1]],AXIS[\"Northing (Y)\",north,ORDER[2]],LENGTHUNIT[\"Meter\",1.0],ID[\"Esri\",\"103872\"]]",
  "description": "GDM2008 LGM2012",
  "authority": "Esri",
  "version": "12.7.0",
  "deprecated": "no",
  "areaname": "Mauritius",
  "extent": {
    "slat": -23.81,
    "nlat": -8.43,
    "llon": 53.8,
    "rlon": 67.05
  }
}