如何在golang模板中转义特殊字符（<>＆'“除外）？

Question

Go templates auto-escape but only the five characters <>&' and " (see html.EscapeString)

so this code like

check := func(err error) {
    if err != nil {
        log.Fatal(err)
    }
}
t, err := template.New("foo").Parse(`{{define "T"}}special chars: {{.}}{{end}}`)
check(err)
err = t.ExecuteTemplate(os.Stdout, "T", "<>&' äåüöß")
check(err)

returns (as you can check here: Go Playground)

special chars: <>&' äåüöß

So how do i use golang templates to render text that may contain characters like äåüöß?

It's not like i could escape these myself, because e.g. "ä" escapes to "&auml;" which means that efter i escape manually, golang just escapes the "&" character part of that a second time and i get "&amp;auml;" (but the html-file should contain a single escaped "&auml;" so that the browser displays an "ä").