If the builder outputs real heading tags into the post content, yes — the plugin reads the rendered content, so a heading produced by a shortcode or a block is found like any other.
Builders that render entirely on the front end from their own template, outside the_content, are the exception. In that case place the list with the shortcode inside the builder's own text widget.
The editor box's check for bold lines and heading levels reads the block editor's blocks, or the classic editor's text. A builder keeps its layout elsewhere, so the box has nothing to say about a page made with one.
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Table of Contents
Give a long post a contents list built from its own headings, and a permanent link to every section.
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