A plugin for the block editor that expands on the existing core block with a sticky header row, an ability to style the first column and make it sticky. It provides also controls to merge/unmerge cells and expand on hover, should there be more columns that fit into the content section.
It was inspired by the work on the Roster of design tools pages on the Make Core blog.
The plugin is in its early stages and is waiting for approval for the WordPress repository.