带字符串的模板继承

I have a few small .html files that I parse like:

template.Must(
    template.New("test").
        ParseFiles(
            "templates/f1.html",
            "templates/f2.html",
            "templates/f3.html",
        ),
)

These are all very small files and, for example, I'd like to make these just strings to make my code easier but how do I do the same type of template inheritance but with strings? All I see is the Parse method, but that only takes 1 string:

func (t *Template) Parse(text string) (*Template, error)

My strings:

f1 := `Hi there {{template "content" .}}`
f2 := `{{define "content"}}bob {{template "content2" .}}{{end}}`
f3 := `{{define "content2"}}ross{{end}}`

Not sure how to make these "play" together. (This is a simplified example of what I'm doing and these strings are used in multiple places so doesn't make sense to combine them all to 1).

Try:

const (
    f1 = `Hi there {{template "content" .}}`
    f2 = `{{define "content"}}bob {{template "content2" .}}{{end}}`
    f3 = `{{define "content2"}}ross{{end}}`
)

func main() {
    t := template.New("test")

    t.Parse(f1)
    t.Parse(f2)
    t.Parse(f3)

    t.Execute(os.Stdout, nil)
}

produces: Hi there bob ross

playground version.