While there is no solution, I use the Windows symbolic link method. In order not to use command lines, I use the "Link Shell Extension" utility. After installing the utility, additional commands will appear in the windows context menu. Having selected the desired source with video files on the PC, which is located outside the VaM folder, I select the "Pick Link Source" command in the context menu of the mouse, then in the VaM folder itself I select the "Symbolic Link" command through the context menu, and there a link to the main folder with video files is created. This is no longer just a shortcut to a folder that the VideoController plugin would not see, but a folder with a symbolic link, which is defined by the plugin as the main folder with video files. In the VaM scene in the VideoController plugin in the video source, I point the path to the created symbolic link. The video files in the created folder are immediately detected and played by this plugin.
Attention, the files in the created symbolic link and the files in the source folder are linked, which means that deleting any file from the symbolic link will delete this file from the parent folder. Therefore, to delete a symbolic link (a child folder), you need to delete it entirely (the created link folder), this will not affect the parent folder with files. The deletion is done through Windows Explorer. This is relevant if you select the "Symbolic Link" command.
There is also another context menu command to create a symbolic link, this is the "Clone symbolic link" command. If you use this mode, the created folder will not have feedback with the main folder of video files. Any changes to the created folder will not affect the files of the main folder. The "Clone symbolic link" command is preferable to use than the "Symbolic Link" command
Also, if the "Video Controller" plugin is already installed in the system, then after creating symbolic links, this plugin may need to be restarted. Otherwise, it is possible that after specifying the source of the video in the plugin, it will not be played, although the source of the video folder will be determined correctly. After restarting the plugin, the video in the specified source will be played in normal mode.
Utility link:
https://schinagl.priv.at/nt/hardlinkshellext/linkshellextension.html#contact
You can also look at other similar utilities, for example here:
https://listoffreeware.com/free-symlink-creator-software-windows/
Link Shell Extension context menu example: