in URP, at least in Unity 6000.27 that I am testing right now, you only have the resolution for soft shadow so you can change the quality for that, also remember that the structure of HDRP and URP are completely different, in URP you can change most of the quality sections in URP Assets. The URP lighting is not that much heavy. the right way is to get the URP assets and change the settings from there.
universalAdditionalLightData.softShadowQuality = SoftShadowQuality.High;