How do I set a dynamic variable in the menu links yml file for route_parameters? I'd like to create a menu item that has a dynamic variable in it, specifically the user's id.  

In my example.routing.yml I have this:

example.test:
  path: '/user/{user}/example'
  defaults:
    _controller: '\Drupal\example\Controller\ExampleController::test'
    _title: 'Test'
  requirements:
    _permission: 'access content'
    user: ^[0-9]+


In my example.links.menu.yml, I have:

example.testlink:
  title: Test Link
  parent: example.parent
  description: 'Test Link'
  route_name: example.test
  weight: 3
  route_parameters: {user: 5}


That "5" is my user id, I'd like to have it pull dynamically from my logged in user.  Is that possible?
Create a second route that has no user parameter and when accessed redirects to the first route with the current user parameter inserted.