Stimulsoft provides a native Blazor designer; assigning a report and handling its save event lets users edit and persist templates.

Place the designer.
<StiBlazorDesigner Report="@Report" OnSaveReport="OnSaveReport" />
Persist on save.
private void OnSaveReport(StiSaveReportEventArgs args)
{
    var reportJson = args.Report.SaveToJsonString();
    // store reportJson where you need
}

How it works. The designer edits the bound report in the browser and raises OnSaveReport when the user saves, so you control where the template goes.
In the screenshot below you can see the result of the sample code:

Editing a Report Template in the Designer

Hi. Need any help?