Don’t request these permissions if your app only requests the camera/gallery for certain forms. Are you using a package that imports them?
Sounds like your app is using older media library APIs where your app gains access to the devices entire media library. The Play Store is asking you to justify the use of the legacy APIs, if you believe that your application truly does need to access a devices entire media library you should appeal this ruling.
Otherwise, you should familiarise yourself with newer APIs such as the Android Photo Picker where your app gains access only to a much smaller set of images on a just-in-time basis following a user interaction. The readme for image_picker and the Android implementation, image_picker_android may be helpful
https://pub.dev/packages/image_picker
https://pub.dev/packages/image_picker_android