SHGD2015 - EPSG:7886

WKT

GEOGCS["SHGD2015", 
	DATUM["St_Helena_Geodetic_Datum_2015", 
		SPHEROID["GRS_1980", 6378137.0, 298.257222101]], 
	PRIMEM["Greenwich", 0.0], 
	UNIT["Degree", 0.0174532925199433]]

WKT2

GEOGCRS["SHGD2015", 
	DATUM["St_Helena_Geodetic_Datum_2015", 
		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], 
	ID["EPSG", "7886"]]

Data from @esri/proj-codes

{
  "wkid": 7886,
  "latestWkid": 7886,
  "macro": "PE_GCS_SHGD2015",
  "name": "SHGD2015",
  "wkt": "GEOGCS[\"SHGD2015\",DATUM[\"St_Helena_Geodetic_Datum_2015\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]]",
  "wkt2": "GEOGCRS[\"SHGD2015\",DATUM[\"St_Helena_Geodetic_Datum_2015\",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],ID[\"EPSG\",\"7886\"]]",
  "description": "SHGD2015",
  "authority": "EPSG",
  "version": "9.0(10.5.1)",
  "deprecated": "no",
  "areaname": "St Helena - St Helena Island",
  "extent": {
    "slat": -16.08,
    "nlat": -15.85,
    "llon": -5.85,
    "rlon": -5.59
  }
}