How to add Countries in Mass Upload on the "Manage Remit to Addresses" Task?

Summary:

We would like to add multiple countries on this task "Manage Remit to Addresses", is there an FBDI or Import Mapp or a web service to do so?

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Version (include the version you are using, if applicable):

23C

Code Snippet (add any code snippets that support your topic, if applicable):