Declare a block so as to be shared between locations

[Maurizio De Santis]

I have two locations, /a and /b . Both of them share these directives

     expires max;
     add_header Cache-Control public;
     add_header ETag "";
     break;

and location /b to has gzip_static on too.

Is there a way to write this without writing two times the common 
directives?
That is, without rewriting the common directives like this:

location /a {
     expires max;
     add_header Cache-Control public;
     add_header ETag "";
     break;
}

location /b {
     gzip_static on;
     expires max;
     add_header Cache-Control public;
     add_header ETag "";
     break;
}

Generally speaking, is there a way to declare a block so as to be shared 
between two or more locations without rewriting the common directives?

Thank you

-- 

Maurizio De Santis
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