SlidePart.Slide: unload memory

[f1nzer]

Hi,
I'm reading large pptx files slide-by-slide with limited RAM (azure functions), so after using SlidePart.Slide property the slide is loaded into memory and will be unloaded only when the pptx will be unloaded which means that memory consumption is growing with every slide.

For now I'm using internal OpenXmlPart.SetPartRootElementToNull() via reflection to release the memory.
https://github.com/OfficeDev/Open-XML-SDK/blob/8a29bec8be9221e6b2eefb962f41b95b8391a773/src/DocumentFormat.OpenXml/Packaging/OpenXmlPart.cs#L608

Is there an official way to unload memory when it's not needed anymore? Or maybe it's possible to mark this method as public?

Thanks.