farm-2.x-dev/modules/core/ui/map/farm_ui_map.routing.yml

farm_ui_map.asset.map_popup:
  path: '/asset/{asset}/map-popup'
  defaults:
    _entity_view: 'asset.map_popup'
  requirements:
    _entity_access: asset.view
    asset: \d+
  options:
    parameters:
      asset:
        type: entity:asset