How to pluralize a name in a template with jinja2?

If I have a template variable called num_countries, to pluralize with Django I could just write something like this:

countr{{ num_countries|pluralize:"y,ies" }}

Is there a way to do something like this with jinja2? (I do know this doesn't work in jinja2) What's the jinja2 alternative to this?

Thanks for any tip!