Custom labels in thumbnail view does not work for video files

[thinKing]

When i create custom label with {size} for the thumbnail view, it is shown correctly for pictures, but not for video fioles (MP4, MOV).
eg: {Width}x{Height} - {Size}
or Filesize: {size}
I found no way to show the file size of a video in a Custom label

remark: the standard label "File size" works for video files, but it is not possible to use it in a custom label

I use XNniew MP version 1.11.5