This will not be immediately useful to you, but it’s worth noting that @Drup had at some point the project of integrating a template engine with tyxml, exactly for the purpose you mention (Choice of template language for tyxml). And some very recent work by @gasche on ocaml-mustache (in particular https://github.com/rgrinberg/ocaml-mustache/pull/58) looks like it could be very useful for that project.
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