Ecto bindingless query operations

Is there a bindingless way to create an Ecto where clause such that it can filter for tests other than equality?

The docs provide the following example:

from Post,
  where: [category: "fresh and new"],
  order_by: [desc: :published_at],
  select: [:id, :title, :body]

What if I wanted to instead filter based off of date (ie all records dated after a specific date) - I know that I can do something like:

from p in Post, 
   where: p.submitted_time > important_date 

If I want to assemble the key, operator and value dynamically, using bindingless syntax, is that possible?