Possible to use a class as composite key in entity framework?

class Book
{
  [Key] public required BookIdentifier Id { get; init; }
}

[Owned]
class BookIdentifier
{
  public required Storefront Storefront { get; init; }
  public required string ListingId { get; init; }
}

class Book
{
  [Key] public required BookIdentifier Id { get; init; }
}

[Owned]
class BookIdentifier
{
  public required Storefront Storefront { get; init; }
  public required string ListingId { get; init; }
}