I am using Sitecore 10.3 with SXA, I am trying to read all the renderings of the current item and get datasource of a required rendering item based on the item ID, But I am  able to see only which are present in final renderings but not able see the renderings from page design.

How can I access the page design renderings.

I tried:

    renderingItem.Visualization.GetRenderings(Sitecore.Context.Device, true);