Electric ground for electric fence outlet question

Hello, I bought an electric fence kit for some goats and horses for a plot of land which requires grounded power outlet.

I wonder if a TT ground connection for the outlet (or fuse circuit the outlet belongs to) would suffice or if I need to redo the whole barns electrics since it's all ungrounded at the moment except for a 3 phase outlet connected to the garages electrics.

I just want to know what I should ask an electrician about when I ask for quote and time. If I need to redo the whole wiring I need to hold until next springto so I really hope for a smaller job :)

If I use wrong terminology Im sorry since English is not my first language