This subject has been discussed here:
https://trac.nginx.org/nginx/ticket/923
I think it is a good idea to have this support.

On Sun, Jul 9, 2017 at 7:55 PM, motor <nginx-forum@forum.nginx.org> wrote:

> The following post is based on the assumptions that 1. upstream HTTP/2
> support is not available in nginx at the moment, and 2. said feature is not
> firmly excluded from nginx's future road map :)
>
> We've been internally using an nginx patch (authored by me) which provides
> this feature in our nginx instances that front-end etcd servers.
> Please let me know if this patch can be a candidate for review and
> potential
> merge.
>
> In case the answer is yes, a heads up: said implementation has been subject
> to a few 'compromises' due to internal deadlines, so I might need a fair
> bit
> of technical guidance/discussion to iron out some design/implementation
> issues.
>
> Posted at Nginx Forum: https://forum.nginx.org/read.
> php?2,275391,275391#msg-275391
>
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