This is doable today using page properties.
I am currently working on something like that:
With the properties you can say that a page is a project, and that it is active or not (or now, later).
I use a template to add the properties:
template:: project
category:: projects
status:: #Completed [[🗄 Archives]] [[Active]] [[Someday/Maybe]] [[Later]]
area::
goal::
related-to::
tags::
time-investment::
reward::
impact::