'how to get image node offset from a FIT file (or .itb) file?

FIT (flattend image tree) is a kind of dtb (device tree blob) file containing some images node under /. It is used in u-boot program.
For example, a dts (device tree source) for a fit file starts like this.

/dts-v1/;

/ {
    timestamp = <0x61c28ac0>;
    description = "ab21m fpga FIT Image";
    #address-cells = <0x01>;

    images {

        kernel {
            description = "Kernel";
            type = "kernel";
            arch = "arm64";
            os = "linux";
            compression = "none";
            load = <0x80000000>;
            entry = <0x80000000>;

If I have a fit file (sometimes with extension .itb) generated from a dts(or .its), how can I know the offset of a specific image node (for example fdt) in the .itb file (FIT file)? I'm following u-boot program but I'm not sure the offset is correct at some point in processing.

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'how to get image node offset from a FIT file (or .itb) file?

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