See the following [thread]( Plans For Hdrp Compatibility For Tmp? page-3#post-7463915) and posts.
These new shaders are included in the latest preview of the TMP package which is version 3.2.0-pre.1 for Unity 2020.x or newer.
Please take the time to review the subsequent posts as there was a new version of SRP (URP & HDRP) recently released that contains API changes which broke the custom inspectors for the shaders included in this preview package. You may run into this issue or perhaps not but just be sure to review those subsequent posts.
I will have an update for those issue available soon.