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There is also a small bent down to the corner that it’s broken.They told me I need also a new frame.because it will be no more waterproof.
If you’d want to “fix” that, apply a little bit of strong and waterproof glue to the crack and let it dry thoroughly.
Inspect it now and then and you should be good. And if you don’t drop your phone in water it isn’t a deal at all.
 
It's an internal part, don't know what else to say. For iPhone 12, 13 and specifically 14 Pro Series (14 series has replaceable rear-glass) if the back is cracked we replace the "Rear", it includes everything except the display and rear camera, which are transferred to the new "Rear".

You can see the very high price showing this on Apple's site, select cracked rear-glass.

You don’t transfer the main boards?
 
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