SimpleTOC – Table of Contents Block
In Gutenberg, add a block and search for “SimpleTOC” or just “TOC”. You need to save your post before you add the block. It works by parsing the post content and retrieving the heading blocks and creates a new dynamic block with a list of links to the headings.
Hide the headline “Table of Contents” and set a maximum display depth in the blocks’ sidebar configuration. Add the CSS class “simpletoc-hidden” to a heading block to remove that specific heading from the generated TOC.