Thanks for reaching out. That is a great question. Let me see if I can clarify that for you.
Adobe Lightroom can read and show you general categories of metadata. Extensive control and management of Metadata are currently not possible in Adobe Lightroom. However, Lightroom Classic deals with metadata comprehensively and hierarchically.
You can keep refining the metadata of your images in large batches & you can also create and customize metadata presets and apply them during import or export. Check this video to help you get started: https://www.youtube.com/watch?v=PTcbh_P8OSk