The Facebook API and the Facebook Ads Manager console work in a different way, that's why sometimes the process to show the same information is different.
Unlike the Facebook Ads Manager console, the Facebook API does not have the "Result" and "Cost per result" metrics, since these metrics are created only in the Facebook Ads Manager to show the main results of each campaign.
Therefore, if a campaign has, for example, "Post engagement" as a goal, the "Result" field will show the result equivalent to the metric "Post engagement", so that in Dataslayer we should select that metric to obtain the result.
To see the conversions in Dataslayer you can also make a table with the "Actions" and "Action type" fields.
As always, please contact us via our live chat on our website or via email if you still have doubts or questions. We are happy to help!