How to cache external fonts with WPFC ?

Hello
Can you please explain caching of fonts with Fastest cache ?
I have a pingdom warning

The following cacheable resources have a short freshness lifetime. Specify an expiration at least one week in the future for the following resources:
http://fonts.googleapis.com/css?family=Lato:400,700&ver=4.5.6
http://fonts.googleapis.com/css?family=Lato:100 … COswald:300,regular,700&subset=latin%2Clatin-ext
http://fonts.googleapis.com/css?family=Lekton&ver=4.5.6
http://fonts.googleapis.com/css?family=Raleway% … 00%2C800%2C900&subset=latin%2Ccyrillic&ver=4.5.6
http://fonts.googleapis.com/css?family=Raleway: … c,700italic,800italic,900italic&subset=latin
https://fonts.googleapis.com/css?family=Raleway … ,700,300|Playfair+Display:regular,700|Montserrat

It is possible to cache external fonts in general ?
Thank you for your help.