Kong custom defaults - _info: unknown field

Questions
1

Hi,
I’m trying to set some custom default values using Kongs declarative configuration

_format_version: '3.0'
_transform: true
_info:
  defaults:
    route:
      strip_path: false
      preserve_host: true

And I’ve got this error

init_by_lua error: /usr/local/share/lua/5.1/kong/init.lua:652: error parsing declarative config file /config/kong_config_local.yaml:
in '_info': unknown field

Do I need to make any other changes in Kong to make it work?