How do the fill(report) command works?

Hi everyone! I've been trying to make a proper report in .docx for my project using Report Generator. And I was doing geat using Document class and moveToNextHolemethod:

            import mlreportgen.dom.*           
            data = docx_getdata;
            doc = Document('Report', 'docx', 'MyTemplate'); %для Report функция наполнения заглушек отличается
            holeId = moveToNextHole(doc);            

            while ~strcmp(holeId, '#end#')
                switch holeId
                    case 'gip'
                        ImportText(r, doc, data, holeId)
                    case 'sostav_pd'
                        ImportText(r, doc, data, holeId)
                    case 'remark_pd'
                        ImportText(r, doc, data, holeId)
                    case 'project_basement'
                        ImportText(r, doc, data, holeId)
                    case 'project_function'
                        ImportText(r, doc, data, holeId)
                    case 'main_calcs'
                        main_calcs.ImportCalcs(doc)
                end

When i needed to input fancy equations, turns out that Document class can't provide me that experience. So, i swithed to Report class and now i dont understand how this fill(report) method, so i can fill holes in my template properly

https://www.mathworks.com/help/rptgen/ug/mlreportgen.report.report.fill.html#d123e44288

I do apologize if i wrote smth wrong and i hope this community can help me out with this.