Not exactly the same as your example, but might suit your needs.
A plugin called Layer Effects has an Inner Glow option. Available from here:
http://registry.gimp.org/node/186
Play around with that, stroking a path and opacity and you can get something similar.
Another option is to use a shaped gradient. Again, play with opacity.
A plugin called Layer Effects has an Inner Glow option. Available from here:
http://registry.gimp.org/node/186
Play around with that, stroking a path and opacity and you can get something similar.
Another option is to use a shaped gradient. Again, play with opacity.