Limiting Focus Depth (F3) to First-Level Subtopics in HTML5 Export as default

I do frequently export my mind maps as interactive HTML5 files for distribution. When viewing these HTML5 maps in a browser, I have noticed that when I select a topic and use the F3 (Focus) function, all sub-branches under the selected topic are expanded at once.

However, I would like to restrict the Focus function so that only the first-level subtopics (immediate children) of the selected topic are shown, with deeper levels remaining collapsed as I can choose in Mindmanager desktop app like this.

Is there a way to configure the HTML5 Export settings or modify the exported files so that the F3 Focus function will only expand one level of subtopics, instead of all descendant branches?

I opened a ticket to solve this issue, and the support team suggest to file a feature request here.

I strongly suggest this way would be more effective for many users.