Modrinth does not currently support Hytale, and Hytale support is not on Modrinth's roadmap at this time.
Modrinth is built specifically around the needs of Minecraft: Java Edition modding. Currently, we are very focused on delivering our vision for Java Edition. Anything beyond that isn't currently in the works. Pivoting our current strategy would ultimately be a disservice to everybody.
Someday, we would love to support more games but we still have a lot of work planned ahead of us before we get there. We want to be able to be in a position where we can begin to support new communities without compromising on our existing ones. Our small team size means that we are already spread thin enough as-is.
For the time being, to find Hytale content, we recommend using platforms that are built specifically for Hytale and its modding ecosystem.