Greetings Artemis,
If you can share it what exactly is it that you mention about the internal external policy?
Although the standards require measurable objectives in practice not all of them can be measurable. Most objectives should of course be measurable so you can have statistical results but some can be based on observation.
A simple example on that is when you set an objective let's say about purchasing a new vehicle and at the review you mention whether you got it or not (giving a few details about it). That is observable. You can say I wanted to purchase 1 vehicle but in my opinion it is a needless overkill.
Apart from that and in your case it depends on what information you want to extract from your communication policy. As internal and external communication can include many things you can break it down to something more specific. Like in external you can mention that you want to have less than 5 complaints from customers or you may want to have more than 10 positive answers to new collaborations. In internal you could say you want 3% increase in feedback from your personnel about your processes or you may want to link 5 more desktops on your platform in key areas to have live data/comm updates etc.
My opinion is for some things to keep them relatively simple but then again the sky is the limit !!!
Regards!