Input password for the encrypted config file from web ui

[contrun]

I am trying to serve rclone web ui with an encrypted config file.
When I run rclone --config /root/.config/rclone/rclone.conf rcd --rc-web-gui --rc-web-gui-no-open-browser, I can navigate to rclone web ui normally. The output is as follows.

2023/05/27 14:50:39 NOTICE: Web GUI exists. Update skipped.
2023/05/27 14:50:39 NOTICE: Serving Web GUI
2023/05/27 14:50:39 NOTICE: Serving remote control on http://127.0.0.1:5572/
2023/05/27 14:50:39 NOTICE: Web GUI is not automatically opening browser. Navigate to http://gui:[email protected]:5572/?login_token=Z3VpOmJnR0dqbVJpX1RuUkdDNnVabXhnWWc%3D to use.

I then navigated to http://127.0.0.1:5572/#/showconfig . I found there is nothing there initially

But the terminal no prompts a password dialog to me

Enter configuration password:
password:

After I have typed the correct password. Now I can see my remote storage list.

So the question is that can I input the password for the config file in web UI? I want to serve rclone web ui in a VPS. It is hard for me to put rclone web ui in a systemd service as programs started from systemd services have no interactive stdin. And I don't want to save my rclone config password in the disk of this untrusted VPS.