DiazCarrete, 
I've published "dani-servant-lucid2" on Hackage. It's a tiny package that provides a HTML content type for Servant, backed by the "lucid2" HTML library.
https://hackage.haskell.org/package/dani-servant-lucid2
https://github.com/danidiaz/dani-servant-lucid2There was already an integration for an earlier version of lucid https://hackage.haskell.org/package/servant-lucid but not for lucid2. https://github.com/haskell-servant/servant-lucid/issues/26
Also, "dani-servant-lucid2" has a public sublibrary with extra definitions, but it seems as if Hackage doesn't display info for public sublibraries yet.