Help with engineer project: Save and Load objects in room WITHOUT anchors?

Hi everyone!
My name is David and I’m doing a final project on Unity during my software engineering graduation.
I build an app where the user scans the room in the house during the construction phase, and the app detects the infrastructures such as water and electricity. Once the house is ready the user can return to the previously scanned room, and use this scan to see where the infrastructures are.
To implement this I thought like this:

  1. Recognize the door in the room, and activate the scanning process of the room to detect infrastructure.
  2. Save the scan somehow.
  3. Re-upload the scan by loading the scan file.
  4. Identify the door again (if necessary) and then the infrastructure will reappear.

In the end, I intend to use machine learning to classify the infrastructures and automatically recognize them and save them in the room scan.
Can I do it WITHOUT anchors? Or at least without cloud anchors?
How can I save the scan?
Is it possible?
I would love guidance.
Thank you for any help!
David

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