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The setting ("Prefixes you want to advertise") is the list of public IP addresses that the customer will advertise to AWS. It is a specific list - on that connection you will only be allowed to advertise the public IP addresses that you specify. Connections to the AWS network will only be allowed from those IP addresses.
The customer should treat the Public VIF as if it was an internet connection (so, firewall, etc.) as explained here.
You treat Public VIF as internet connection. You can't advertise private IPs. And traffic routing the Public VIF must have registered Public IP as a source. If you are going to access AWS Public services using your on-premise private network, then you will have a sort of NATing. The public IP for your NATing can be added to the "Prefixes you want to advertise".
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Can the private IPs be used in the 'Prefixes you want to advertise' to allow only the IPs from the on-prem to access the AWS ?
No, you cannot use private IP addressing on a public VIF.