This is probably obvious and it isn't 100% alternative to Javascript syntax, but you can leverage Default trait to come a bit closer:

  #[derive(Default)]
  struct Person {
      name: String,
      email: Option<String>,
  }

  fn main() {
      let person = Person {
          name: "John Doe".to_owned(),
          ..Default::default()
      };
  }

The deal breaker with `..Default::default()` is that it only works for structs without any required fields.

Forgetting a required field just means you get the dummy value from Default, that is, if you even manage to implement Default for the struct at all (the required fields may not have a sensible default value)

It would be really nice if .. could be a shortcut for ..Default::default() which would match the syntax of pattern matching.