INAGeoid2020 height - EPSG:9471

WKT

VERTCS["INAGeoid2020_height", 
	VDATUM["Indonesian_Geoid_2020"], 
	PARAMETER["Vertical_Shift", 0.0], 
	PARAMETER["Direction", 1.0], 
	UNIT["Meter", 1.0]]

WKT2

VERTCRS["INAGeoid2020_height", 
	VDATUM["Indonesian_Geoid_2020"], 
	CS[vertical, 1], 
	AXIS["Gravity-related height (H)", up, 
		LENGTHUNIT["Meter", 1.0]], 
	ID["EPSG", "9471"]]

Data from @esri/proj-codes

{
  "wkid": 9471,
  "latestWkid": 9471,
  "macro": "PE_VCS_INAGEOID2020_HEIGHT",
  "name": "INAGeoid2020_height",
  "wkt": "VERTCS[\"INAGeoid2020_height\",VDATUM[\"Indonesian_Geoid_2020\"],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "VERTCRS[\"INAGeoid2020_height\",VDATUM[\"Indonesian_Geoid_2020\"],CS[vertical,1],AXIS[\"Gravity-related height (H)\",up,LENGTHUNIT[\"Meter\",1.0]],ID[\"EPSG\",\"9471\"]]",
  "description": "INAGeoid2020 height",
  "authority": "EPSG",
  "version": "9.9(12.9.0)",
  "deprecated": "no",
  "areaname": "Indonesia",
  "extent": {
    "slat": -13.95,
    "nlat": 7.79,
    "llon": 92.01,
    "rlon": 141.46
  }
}