Is there any way through which I can transfer money from zelle to cash app?

No, there is no way to do so as zelle does not come with any digital wallet just like the cash app does. You can not transfer money from zelle to cash app directly. But despite this fact, you can do one thing. You can link your bank account to both cash transferring services. And you will have to use the linked bank account. All you can do is send your money from the cash app and zelle app to your bank account. Then, only you can access the money.