You can access the renderingContent parameter within the refinementList widget via the transformItems function. The full results data is available, which includes all regular response parameters, as well as parameters from the helper.
In the example below we have pinned facet values for the attribute brand which can be accessed on the results object.
results.renderingContent.facetOrdering.values.brand.order
Here's an example CodeSandBox showing how you can access the facet values that have been pinned. You can use these pinned values to compare to an item's label or value.