How to convert online installer into offline?

Here’s what I mean. On my PC, I made a working USB OpenCore installer using Dortania. It’s working great! However, I don’t have an Internet connection to install Big Sur on my laptop. However, I have a Mac on which I have a full copy of Install Big Sur.app. Is there a way I can have that be included in the USB??? I’m so close to installing my first Hackintosh ever!

submitted by /u/No-Set7742
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