You are on the right track with Jsoup but lets refine the approach to be more dynamic and flexible, your goal is to extract specific sections without hardcoding element structures, so a more generic solution involves using Jsoup's selectors dynamically based on user input.

Approach:

Use Jsoup to parse the HTML
Extract sections dynamically
Handle both text and tables appropriately
Convert extracted content into JSON 

Step-by-Step Solution
1. Parse the HTML using Jsoup
        Document doc = Jsoup.parse(htmlContent);
2. Locate the section dynamically
Instead of hardcoding specific elements, allow users to provide section names:
    Element section = doc.selectFirst("#your-section-id");

3. Extract content dynamically
Since the section may contain both plain text and tables, handle them accordingly:

    String textContent = section.text();
Elements tables = section.select("table");

JSONArray jsonTables = new JSONArray();
for (Element table : tables) {
    JSONArray tableData = new JSONArray();
    for (Element row : table.select("tr")) {
        JSONObject rowData = new JSONObject();
        Elements cells = row.select("td, th");
        for (int i = 0; i < cells.size(); i++) {
            rowData.put("column_" + (i + 1), cells.get(i).text());
        }
        tableData.put(rowData);
    }
    jsonTables.put(tableData);
}

JSONObject result = new JSONObject();
result.put("text", textContent);
result.put("tables", jsonTables);

System.out.println(result.toString(4)); 

Making It a Reusable Library
To integrate this into your application as a Maven dependency:

Wrap it in a class with a method extractSection(String sectionId).

Package it into a JAR and deploy it to Maven.

public class HtmlExtractor {
    public static JSONObject extractSection(String htmlContent, String sectionId) {
        Document doc = Jsoup.parse(htmlContent);
        Element section = doc.selectFirst(sectionId);
        if (section == null) return null;

        String textContent = section.text();
        Elements tables = section.select("table");

        JSONArray jsonTables = new JSONArray();
        for (Element table : tables) {
            JSONArray tableData = new JSONArray();
            for (Element row : table.select("tr")) {
                JSONObject rowData = new JSONObject();
                Elements cells = row.select("td, th");
                for (int i = 0; i < cells.size(); i++) {
                    rowData.put("column_" + (i + 1), cells.get(i).text());
                }
                tableData.put(rowData);
            }
            jsonTables.put(tableData);
        }

        JSONObject result = new JSONObject();
        result.put("text", textContent);
        result.put("tables", jsonTables);

        return result;
    }
}

Next Steps
Test different HTML structures to ensure flexibility.

Enhance error handling to deal with missing sections or empty tables.

Consider XML serialization if needed for integration.
Please let me know above solution fit or not. Thank You !!