Curve Effect

[Blighty]

That text has an italic effect on it. Probably more than standard italic, so use the Shear Tool to give it the italic look. Having done that, right click on the layer in the layers dialogue and do "Alpha to Selection". Then "Select > To Path" and finally "Select > None". You now have the text as a path.

Then use the Ofnuts Bend Path plug-in. Details here:
https://www.gimp-forum.net/Thread-ofn-bend-path

Not sure of your experience level. Ask here again if having difficulties.