Nothing Gimp I know of off-the-shelf: Maybe someone will come up with one. Otherwise it is write your own script and one of the clever guys might give advice.
However for batch operations ImageMagick is better. https://imagemagick.org It is command line and you will need to include the commands in a Windows batch file with a variable for the individual images. Use png's rather than .xcf
For example: To add the 'variable' image to a fixed bottom layer
Then add the 'top' layer to the previous combined layer essentially the same command
and delete the temporary file
That sequence gives this. https://i.imgur.com/FCmomWj.jpg
However for batch operations ImageMagick is better. https://imagemagick.org It is command line and you will need to include the commands in a Windows batch file with a variable for the individual images. Use png's rather than .xcf
For example: To add the 'variable' image to a fixed bottom layer
Code:
composite -gravity Center 01.png bg.png temp.png
Then add the 'top' layer to the previous combined layer essentially the same command
Code:
composite -gravity Center logo.png temp.png 01-combined.png
and delete the temporary file
Code:
del temp.png
That sequence gives this. https://i.imgur.com/FCmomWj.jpg