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I'm currently developing a web application with the Phoenix framework, which makes use of .html.heex templates. Highlighting and Tailwind CSS works out of the box, however my Tailwind LSP was not working correctly in these templates. I had to fiddle a bit and search a lot of issues/comments, so here is a working LSP configuration for heex+tailwind:

nvim_lsp.tailwindcss.setup{ 
    filetypes = { "aspnetcorerazor", "astro", "astro-markdown", "blade", "clojure", "django-html", "htmldjango", "edge", "eelixir", "elixir", "ejs", "erb", "eruby", "gohtml", "haml", "handlebars", "hbs", "html", "html-eex", "heex", "jade", "leaf", "liquid", "markdown", "mdx", "mustache", "njk", "nunjucks", "php", "razor", "slim", "twig", "templ", "css", "less", "postcss", "sass", "scss", "stylus", "sugarss", "javascript", "javascriptreact", "reason", "rescript", "typescript", "typescriptreact", "vue", "svelte" },
    on_attach = on_attach,
    init_options = {
      userLanguages = {
        elixir = "html-eex",
        eelixir = "html-eex",
        heex = "html-eex",
      },
    },
    settings = {
      tailwindCSS = {
        experimental = {
          classRegex = {
            [[class= "([^"]*)]],
            [[class: "([^"]*)]],
            '~H""".*class="([^"]*)".*"""',
          },
        },
      },
    },
}