Are you looking to add a header section to a grid view, similar to a header section in a spreadsheet, including a title and some free-form text?
I’m afraid that is a fundamental difference between a spreadsheet and a database like Airtable.
As Steven has pointed out, you can group records in a grid view. You can actually group records on any field, not just single-select fields. However, you cannot give the grouping a title and free-form text like you could with a spreadsheet.
You could try building an interface with multiple grids. You can add free-form text above each grid. However, that might not be whar you are looking for.