Can I use time notation in query expression?

I have the need to create Singestat tiles that show multiple calendar based percentages, independent of the time range selector. For example, week-to-date, last week, two weeks ago, three weeks ago, last month, month before that, year-to-date, etc. Basically, based on ‘now’ it needs to be able to snap to certain times. The Grafana time range syntax covers exactly what I need, but it looks like I can’t use it in my query expression, only actual variables (start, etc.) are evaluated. Is there a way to have other parts of my expression evaluated? Something like {now-1M/M} …