In addition to the example you linked, the following link also gives an example of a MATLAB program that generates a more thorough report of a Simulink model:
https://www.mathworks.com/help/releases/R2024a/rptgenext/ug/generate-system-design-report-with-report-api.html
It doesn't include the exact information from your questions, but it gives some additional examples of what you can do with Simulink report generator methods.
Now for your questions:
1. You can include graphs generated by figures in a report with the mlreportgen.report.Figure reporter:
https://www.mathworks.com/help/rptgen/ug/mlreportgen.report.figure-class.html
You can create the Figure reporter with just the figure handle and then add it to the report/chapter/section:
figReporter = mlreportgen.report.Figure(f); % f is figure handle, or use f=gcf for current figure
append(rpt, figReporter);
For reporting the Data Inspector information, you can create a snapshot of the Data Inspector with the method Simulink.sdi.snapshot:
https://www.mathworks.com/help/simulink/slref/simulink.sdi.snapshot.html
This creates a MATLAB figure that displays the snapshot. You can then add the figure to the report using the method above.
Alternatively, you can use the simulink.sdi.report method:
https://www.mathworks.com/help/simulink/slref/simulink.sdi.report.html
Or create a report with the Data Inspector UI:
https://www.mathworks.com/help/simulink/ug/create-an-interactive-comparison-report.html
This will generate an HTML file separate from the report generated with Simulink report generator, but it provides more customization options than just the Simulink.sdi.snapshot.
2. The "Generate System Design Report" example linked above includes a section that summarizes variables used by Simulink blocks, including those defined in the base workspace. The code is defined in the "makeDesignDataChapter" function. Alternatively, to summarize all variables in the base MATLAB workspace, regardless of whether you are used by a Simulink block, you can use the MATLABVariableFinder and SummaryTable classes:
varFinder = mlreportgen.finder.MATLABVariableFinder(); % By default this searches the MATLAB base workspace for variables
varResults = find(varFinder);
varTable = mlreportgen.report.SummaryTable(varResults);
varTable.Properties = ["Name", "Class", "Value"];
append(rpt, varTable);
3. You can easily add the MATLAB figure graphs, Data Inspector snapshots, and the variable summary table to the same slreportgen.report.Report object, and they will be output in the same report. The full Data Inspector report is generated as a separate HTML file. You can add this file to the report using mlreportgen.dom.HTMLFile, but you may lose some formatting. Example:
sdiReportFile = "sdireports/mySdiReport.html"; % Change to whatever your file name is
htmlFileObj = mlreportgen.dom.HTMLFile(sdiReportFile);
append(rpt, htmlFileObj);
