Import project's Custom Fields

[Bryan Tackaberry]

Hi all,

I'm migrating from an old external system into Jira using the System's External System Import option, having built a valid json file.  For each issue I've included a custom field values array ("customFieldValues": []). When the importer first encounters a new custom field I get the warning "Custom field not found. Creating a new custom field for...".

Is there a way, at project level rather than the issue level, to define expected custom fields, hence avoid these warnings?  

Many thanks,

Bryan