You already do so for the overall structure of the body (the sections) in the object of the document at the end of the Introduction. What is special, unexpected, or different in your approach?
You can similarly prepare your readers for an upcoming division into subsections by introducing a global paragraph between the heading of a section and the heading of its first subsection. Mention these things early in your paragraph, ideally in the first sentence.
Consider anchoring the context in time, using phrases such as recently, in the past 10 years, or since the early 1990s.
You may also want to anchor your context in space (either geographically or within a given research field).
This sentence expresses first the objective, then the action undertaken to reach this objective, thus creating a strong and elegant connection between need and task.
Here are three examples of such a combination: An Introduction is usually clearer and more logical when it separates what the authors have done (the task) from what the paper itself attempts or covers (the object of the document).
In the Introduction section, state the motivation for the work presented in your paper and prepare readers for the structure of the paper.
Write four components, probably (but not necessarily) in four paragraphs: context, need, task, and object of the document.