Latvia 2000 height - EPSG:7700

WKT

VERTCS["Latvia_2000_(height)", 
	VDATUM["Latvian_Height_System_2000"], 
	PARAMETER["Vertical_Shift", 0.0], 
	PARAMETER["Direction", 1.0], 
	UNIT["Meter", 1.0]]

WKT2

VERTCRS["Latvia_2000_(height)", 
	VDATUM["Latvian_Height_System_2000"], 
	CS[vertical, 1], 
	AXIS["Gravity-related height (H)", up, 
		LENGTHUNIT["Meter", 1.0]], 
	ID["EPSG", "7700"]]

Data from @esri/proj-codes

{
  "wkid": 7700,
  "latestWkid": 7700,
  "macro": "PE_VCS_LATVIA_2000_HT",
  "name": "Latvia_2000_(height)",
  "wkt": "VERTCS[\"Latvia_2000_(height)\",VDATUM[\"Latvian_Height_System_2000\"],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "VERTCRS[\"Latvia_2000_(height)\",VDATUM[\"Latvian_Height_System_2000\"],CS[vertical,1],AXIS[\"Gravity-related height (H)\",up,LENGTHUNIT[\"Meter\",1.0]],ID[\"EPSG\",\"7700\"]]",
  "description": "Latvia 2000 height",
  "authority": "EPSG",
  "version": "8.8.1(10.5.0)",
  "deprecated": "no",
  "areaname": "Latvia - onshore",
  "extent": {
    "slat": 55.67,
    "nlat": 58.09,
    "llon": 20.87,
    "rlon": 28.24
  }
}