This tool converts from plain HTML to Gomponents (https://github.com/maragudk/gomponents), a great Go library for generating static HTML in a more type-safe way than the default html/templates. It's usable as both a server (with an HTML or an API, if you so choose) and as a CLI.
A hosted version can be found at https://gomponents.morehart.dev.
go install github.com/traherom/gomponentsconverter/cmd/gomponentsconverter@latest
gomponentsconverter serve --port=3333
echo '<div>ioj</div>' | gomponentsconverter convert