pagesLayout set pageName dynamically

I'm trying to create a function to set the pagesLayout property of the report settings without hardcoding the page name. e.g. below replacing the "ReportSection" page name with a string variable rptPageName.  Is there any way to do this? updatePageSettings ("ReportSection") function updatePageSettings (rptPageName){ var pageSizeSetting {...} var pageLayoutSetting {...} let settings = {     layoutType: models.LayoutType.Custom,     customLayout: {        pageSize: pageSizeSetting,        displayOption: models.DisplayOption.FitToPage,        pagesLayout: {             rptPageName : pageLayoutSetting        }     } } };