South Asia Singapore - ESRI:37207

WKT

GEOGCS["GCS_South_Asia_Singapore", 
	DATUM["D_South_Asia_Singapore", 
		SPHEROID["Fischer_Modified", 6378155.0, 298.3]], 
	PRIMEM["Greenwich", 0.0], 
	UNIT["Degree", 0.0174532925199433]]

WKT2

GEOGCRS["GCS_South_Asia_Singapore", 
	DATUM["D_South_Asia_Singapore", 
		ELLIPSOID["Fischer_Modified", 6378155.0, 298.3]], 
	PRIMEM["Greenwich", 0.0], 
	CS[ellipsoidal, 2], 
	AXIS["Longitude (lon)", east, 
		ORDER[1]], 
	AXIS["Latitude (lat)", north, 
		ORDER[2]], 
	ANGLEUNIT["Degree", 0.0174532925199433], 
	ID["Esri", "37207"]]

Data from @esri/proj-codes

{
  "wkid": 37207,
  "latestWkid": 37207,
  "macro": "PE_GCS_S_ASIA_SINGAPORE",
  "name": "GCS_South_Asia_Singapore",
  "wkt": "GEOGCS[\"GCS_South_Asia_Singapore\",DATUM[\"D_South_Asia_Singapore\",SPHEROID[\"Fischer_Modified\",6378155.0,298.3]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]]",
  "wkt2": "GEOGCRS[\"GCS_South_Asia_Singapore\",DATUM[\"D_South_Asia_Singapore\",ELLIPSOID[\"Fischer_Modified\",6378155.0,298.3]],PRIMEM[\"Greenwich\",0.0],CS[ellipsoidal,2],AXIS[\"Longitude (lon)\",east,ORDER[1]],AXIS[\"Latitude (lat)\",north,ORDER[2]],ANGLEUNIT[\"Degree\",0.0174532925199433],ID[\"Esri\",\"37207\"]]",
  "description": "South Asia Singapore",
  "authority": "Esri",
  "version": "4.0.0",
  "deprecated": "no",
  "areaname": "Singapore",
  "extent": {
    "slat": 1.13,
    "nlat": 1.47,
    "llon": 103.59,
    "rlon": 104.07
  }
}