You will get this objects in report template:
const content = frappe.render_template(template, {
title: __(this.report_name),
subtitle: print_settings?.include_filters ? filters_html : null,
filters: applied_filters,
data: data,
original_data: this.data,
columns: columns,
report: this,
});
Reference:
When Printing/PDF a report:
Default Frappe Template:

