How to generate "image_index" and "version" under "files" in the manifest for the dfu_application.zip file as needed by the Flutter nRF Connect Device Manager

We're using Flutter to build a Bluetooth app for both Android and iOS smartphones.  In order to avoid producing a parsing error, it apparently needs a defined "image_index" and "version" as seen below, which we've manually inserted.  Is there a Kconfig parameter that needs to be set in the nRF connect plug-in for Visual Studio Code to generate these entries?  I've tried Firmware Metadata version number (FW_INFO_FIRMWARE_VERSION) and mcuBOOT Image version (MCUBOOT_IMAGE_VERSION), neither of which produces those fields in the manifest.

I would appreciate any help you can give.  Eventually we'll automate the version number in our DevOps but for now we'd like to manually set it in the VSCode.

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