ETRS89 + DKLAT(2023) depth - EPSG:10556

WKT

HVCOORDSYS["ETRS89_and_DKLAT(2023)_depth", 
	GEOGCS["GCS_ETRS_1989", 
		DATUM["D_ETRS_1989", 
			SPHEROID["GRS_1980", 6378137.0, 298.257222101]], 
		PRIMEM["Greenwich", 0.0], 
		UNIT["Degree", 0.0174532925199433]], 
	VERTCS["DKLAT(2023)_depth", 
		VDATUM["Denmark_Lowest_Astronomical_Tide_(2023)"], 
		PARAMETER["Vertical_Shift", 0.0], 
		PARAMETER["Direction", -1.0], 
		UNIT["Meter", 1.0]]]

WKT2

COMPOUNDCRS["ETRS89_and_DKLAT(2023)_depth", 
	GEOGCRS["GCS_ETRS_1989", 
		DATUM["D_ETRS_1989", 
			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["DKLAT(2023)_depth", 
		VDATUM["Denmark_Lowest_Astronomical_Tide_(2023)"], 
		CS[vertical, 1], 
		AXIS["Gravity-related height (H)", down, 
			LENGTHUNIT["Meter", 1.0]]], 
	ID["EPSG", "10556"]]

Data from @esri/proj-codes

{
  "wkid": 10556,
  "latestWkid": 10556,
  "pcsWkid": 0,
  "gcsWkid": 4258,
  "vcsWkid": 10550,
  "macro": "PE_HVC_ETRS89_DKLAT_2023_DEPTH",
  "name": "ETRS89_and_DKLAT(2023)_depth",
  "wkt": "HVCOORDSYS[\"ETRS89_and_DKLAT(2023)_depth\",GEOGCS[\"GCS_ETRS_1989\",DATUM[\"D_ETRS_1989\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],VERTCS[\"DKLAT(2023)_depth\",VDATUM[\"Denmark_Lowest_Astronomical_Tide_(2023)\"],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",-1.0],UNIT[\"Meter\",1.0]]]",
  "wkt2": "COMPOUNDCRS[\"ETRS89_and_DKLAT(2023)_depth\",GEOGCRS[\"GCS_ETRS_1989\",DATUM[\"D_ETRS_1989\",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[\"DKLAT(2023)_depth\",VDATUM[\"Denmark_Lowest_Astronomical_Tide_(2023)\"],CS[vertical,1],AXIS[\"Gravity-related height (H)\",down,LENGTHUNIT[\"Meter\",1.0]]],ID[\"EPSG\",\"10556\"]]",
  "description": "ETRS89 + DKLAT(2023) depth",
  "authority": "EPSG",
  "version": "11.006(13.4.0)",
  "deprecated": "no",
  "areaname": "Denmark - offshore",
  "extent": {
    "slat": 54.36,
    "nlat": 58.27,
    "llon": 3.25,
    "rlon": 16.51
  }
}