Unfortunately, I don’t think that this is something possible directly in HubSpot because there is no such thing as a “Days left until the close date” property in HubSpot and Custom reports relies on properties, but here are somethings that you could try to create that property.
1- If you know how to code, that would be easy to achieve what you want by creating and updating a “Days left until the close date” deal property using HubSpot APIs:
https://developers.hubspot.com/docs/methods/deals/update_deal
2- If you don’t know how to code, a workaround could be to create “Days left until the close date” contact property and use a “date-centred contact workflow” to update your “Days left until the close date” deal property
Do not hesitate to ask questions about either suggestion.