FEH2010 - EPSG:5593

WKT

GEOGCS["GCS_FEH2010", 
	DATUM["D_Fehmarnbelt_Datum_2010", 
		SPHEROID["GRS_1980", 6378137.0, 298.257222101]], 
	PRIMEM["Greenwich", 0.0], 
	UNIT["Degree", 0.0174532925199433]]

WKT2

GEOGCRS["GCS_FEH2010", 
	DATUM["D_Fehmarnbelt_Datum_2010", 
		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", "5593"]]

Data from @esri/proj-codes

{
  "wkid": 5593,
  "latestWkid": 5593,
  "macro": "PE_GCS_FEH2010",
  "name": "GCS_FEH2010",
  "wkt": "GEOGCS[\"GCS_FEH2010\",DATUM[\"D_Fehmarnbelt_Datum_2010\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]]",
  "wkt2": "GEOGCRS[\"GCS_FEH2010\",DATUM[\"D_Fehmarnbelt_Datum_2010\",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\",\"5593\"]]",
  "description": "FEH2010",
  "authority": "EPSG",
  "version": "7.9.1(10.1.1)",
  "deprecated": "no",
  "areaname": "Europe - Fehmarnbelt outer",
  "extent": {
    "slat": 54.33,
    "nlat": 54.83,
    "llon": 10.66,
    "rlon": 12.01
  }
}