[Flutter] flutter base64encode hash

I have a sha256 hash which is 5d753fd209b8cb9dff6801edbc60f2fdc00abff56bf3ef8c0f7cf9b975a2a1f9

and i know what i should get at the end which is this base64 encoded String N7m2mKF7vY8tM8PVvkPONqnu5gdXWPm+vcT3lkpBWZ8=

but can't figure out how to get this. Just now i have tryed this

var hexString = '5d753fd209b8cb9dff6801edbc60f2fdc00abff56bf3ef8c0f7cf9b975a2a1f9';
var hexArray = HexUtils.decode(hexString);
var base64String = base64Encode(hexArray);
print('base64String: $base64String');


which print's to the console

XXU/0gm4y53/aAHtvGDy/cAKv/Vr8++MD3z5uXWiofk=

what is not what i want. It should give me

N7m2mKF7vY8tM8PVvkPONqnu5gdXWPm+vcT3lkpBWZ8=

Any help is very much appreciated. Thank you so much.

I use the package basic_utils for HexUtils.decode and dart:convert for base64Encode

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