在Golang中,如何将特定类型的地图定义为唯一类型?

So I'm at that awkward place where I'm trying to pass context data over to a template, and there's not a whole lot of really great examples out there that don't involve passing a preexisting structure. The best I have come up with is something like the following:

templ.Execute(writer, map[string]interface{}{
    "thingyA": ThingyA,
    "thingyB": ThingyB,
})

Using the above, I can reference ThingyA and all of its properties and methods in my template by using {{ .thingyA.[PROPERTY] }}. So that's pretty good in itself, in that it allows me to define a context in a simple Django-ish fashion, without using an anonymous struct, which would be a bit clunky.

But I'm wondering if there is some way to define a new type Context, so that I could simplify the above to the following:

templ.Execute(writer, Context{
    "thingyA": ThingyA,
    "thingyB": ThingyB,
})

That is, I would like to define a specific type Context that always has the form map[string]interface{}, and can be initialized in the same manner as a map. Any ideas on how to go about this?

type Context map[string]interface{}
c := Context{"foo": 1, "bar": 2}

Playground.