Getting depth value from Shadow map in shader

I am trying to modify Internal-ScreenSpaceShadows.shader and to achieve what I want, I need to be able to read the actual depth values from the Shadow map, rather than just doing depth testing to see if it is in shadow or not.

As I am using DirectX11, the shadow map that is defined in Internal-ScreenSpaceShadows is as follows: UNITY_DECLARE_SHADOWMAP(_ShadowMapTexture) where #define UNITY_DECLARE_SHADOWMAP(tex) Texture2D tex : register(t15); SamplerComparisonState sampler##tex : register(s15);. The SamplerComparisonState allows it to do hardware PCF which returns a value, either 0 or 1, if is being occluded or not, however I am trying to sample the actual depth value instead.

I have tried:

(coord is a float4)

tex2D(_ShadowMapTexture, coord.xy) -> Error

tex2Dproj(_ShadowMapTexture, coord) -> Error

_ShadowMapTexture.Sample(sampler_ShadowMapTexture, coord.xy) -> Error

_ShadowMapTexture.Sample(sampler_ShadowMapTexture, coord) -> Error

I have also tried making a separate sampler2D and Texture2D (with SamplerState sampler) and then using command buffers to blit the current shadowmap to that texture, but it only gives me a depth of 0 (all black). However, if I blit the shadowmap into a seperate Texture2D and then use

UNITY_DECLARE_SHADOWMAP(_ShadowBlit); _ShadowBlit.SampleCmp(sampler_ShadowBlit, coord.xy, coord.z)

it then works because it is using PCF. Does anyone know how to get the actual depth value from the shadowmap? Any help will be greatly appreciated