Yes and it's very easy to do so!
Let the person know that they will need to download the Yespark application, have them login to your account on their phone with your credentials and finally enter their phone number under the "Account" -> "Share My Remote Control" section to enable the access. Please insert all the plate numbers in the application.
Once this is done, the car park will be accessible to your significant other :)
You remain responsible in case of degradation, non-payment, etc..
Moreover, it is not possible to share the costs through the application.