The CoolProp library implements two models for Ammonia (NH3) - aq; note that both are incompressible models only. The correlations come from Melinder and Skovrup. See details on the available models.
Here, let's see what is available from these models.
import CoolProp.CoolProp as CP
h=CP.PropsSI("H", "P", 101325, "T", 293.15, "Water")
print("Enthalpy is ", h)
fluidname = "INCOMP::MAM[0.23]"
h = CP.PropsSI("H", "T", 293., "P", 101325, fluidname)
print("Enthalpy is ", h)
fluidname = "INCOMP::MAM2[0.23]"
h = CP.PropsSI("H", "T", 293., "P", 101325, fluidname)
print("Enthalpy is ", h)