When using headings with a [[page name]] in it, create a "search embed query" with all those headings expanded

obsidian.templater.query.section.keyword-page-name.js

<%*
const noteName = tp.file.title;
let queryKeyword = await tp.system.prompt("Keyword for Section search query (do NOT add [ ] brackets around it)", noteName);
if(queryKeyword) {
    // Un-comment the next line if you want the keyword to require [] brackets around it for backlinks matching purposes
    queryKeyword = `\\[\\[${queryKeyword}[\\|\\]]`; // the | pipe check accounts for alias links
    tR = `
# Keyword Section Query

\`\`\`query
section:(/^#+ .*${queryKeyword}.*\\n+\\S[\\s\\S]*[^\\n]/) OR section:(/^#+ .*${queryKeyword}.*/ section:(/[\\s\\S]*[^\\n]/))
\`\`\`
`
} else {
    return;
}
%>

Oddly enough for all of the sub text and sub headings to show up with the complex RegEx used in this query, you have to DISABLE the "Show more context" button, which is available if you are looking at this in Search results or if you have the Obsidian Query Control plugin installed (via BRAT).

Also keep in mind this is specifically for Headings / Section searches so will NOT show you ALL [[backlinks]] but only the ones where the [[backlink]] is in a Heading (and then all of the content below that Heading).