You can apply attribution models to your column metrics like so:
Click on the Gear of the metric

Then at the bottom, you should see "Use non-default attribution model"

This will bring up a window that will allow you to choose a Model and lookback window:

You can create new columns using the same metric, but apply different models to see how the values change (You will also notice that additional text is added to the metric to indicate the model in use):

It should be noted that not all metrics can use custom attributions, Page Views, Visits, Unique Visitors, Occurrences, etc have this feature disabled.
But, if you need to use a custom attribution as part of a calculated metric (where maybe only the numerator or the denominator needs attribution applied (but not both), you can apply attribution inside the calculated metric builder, here is a video showing how to use that feature:
https://experienceleague.adobe.com/docs/analytics-learn/tutorials/analysis-workspace/attribution-iq/attribution-iq-in-calculated-metrics.html?lang=en