Gorm How to define select result format?

gorm select code

var banners []map[string]any
db.Table("banners").Select("`image`").Where("`order` > 0").Order("`order`").Find(&banners)

gorm default result

[
            {
                "image": "https://img.cc/banner-1.jpg"
            },
            {
                "image": "https://img.cc/banner-2.jpg"
            }
]

but,i want result

[
        "https://img.cc/banner-1.jpg",
        "https://img.cc/banner-2.jpg"
]

What to do?