Eloqua API campaign creation endpoint how to set custom fields values

Hi API team,

I'm using (POST) api/rest/2.0/assets/compaign endpoint to create my Eloqua campaigns. I need to set custom fields values in my campaign (From Eloqua console it is from campaign->Options->campaign fields -> custom fields -> {my_custom_campaign_field}->{value}).

I don't seem to be able to set this value from API. I thought it should be under "filedValues" parameter as an array from within the JSON body. But I am not sure how this fieldValues array should be set up to set {my_custom_campaign_filed} with {value} inside this "fieldValues" array. Or this might not be the right parameter to use.