Yes, and you should. Everything Lyra makes is a draft that's yours to change. It gives you a strong starting point, and the final version is however you want it.
Do I own the content?
It's yours to use. Lyra drafts it from your profile and your details, and once you've made it your own you can use it anywhere you like.
Will my content be unique?
Lyra writes from your own profile, your release details and the context you add, so it reflects you rather than spitting out a template. The more you edit, the more it becomes yours.