How to query a dbSet, that implements an interface, from a reflection obtained Type

I have this interface, that many of my data models use:

public interface IHasPrimaryImageProperty
{
    PrimaryImageDataModel PrimaryImage { get; set; }
    int? PrimaryImageId { get; set; }
}

Where PrimaryImageDataModel is:

public class PrimaryImageDataModel
{
    public int Id { get; set; }
    public string ImageFile { get; set; }
    public int TotalItemsUsingImage { get; set; }
}

I want populate TotalItemsUsingImage, by searching across all records (of all data models that implement IHasPrimaryImageProperty) to perform a count.

So far I have managed to get a list of types that implement the IHasPrimaryImageProperty.

But I haven't been able to work out how to query each Type in the list to see how many records are using specified image. Please see the example below for a demonstration of what I would like to acheive.

public static PrimaryImageDataModel GetImageUsageTotals(PrimaryImageDataModel image)
{
    var typesUsingImage = GetTypesWithPrimaryImageProperty();
    int totalUsingImage = 0;
    foreach (Type typeUsingImage in typesUsingImage)
    {
        // I WOULD LIKE TO DO SOMETHING LIKE THIS
        totalForType = db.Set<typeUsingImage>().Where(x => x.PrimaryImageId == image.Id).Count()

        totalUsingImage += totalForType;
    }
    image.TotalItemsUsingImage = totalUsingImage;
    return image;
}


public static IEnumerable<Type> GetTypesWithPrimaryImageProperty()
{
    var currentAssembly = Assembly.GetExecutingAssembly();
    foreach (Type type in currentAssembly.GetTypes())
    {
        if (type.GetInterfaces().Contains(typeof(IHasPrimaryImageProperty)))
        {
            yield return type;
        }
    }
}