From_group - Is it possible to add a release group with spaces in the name?

Hello Flexget gurus,

In my series configuration, I use from_group to specify the release groups to filter the series entries. For example:

series:
  - show name:
      from_group:
        - group1
        - group2
        - group with space

However, there is a release group that has a space in their name.
Flexget seems to ignore group names with spaces.
Is this the expected behavior? Is there a correct way to escape the space? e.g. group\ with\ space