PWA Filtering on Current Date

[MDWigs]

Hi,

I am trying to create a custom View in PWA that shows all of the tasks
that finish anytime between the current date and a week from now.

I can set the first part of the filter:

"Finish - Greater Than or Equal To - Today"

But how can I set the second constraint?

I basically want it to say:

"Finish - Less Than or Equal To - Today + 7"

but Project wont accept the syntax "Today + 7". How do I get it to
dynamically calculate the second constraint date?

This filter needs to be included in the view as I don't was users
themselves setting it up.

Can anybody help?

Thanks in advance,
MDWigs