The UK government suggested establishing a unique dispute resolution mechanism between UK and EU after Brexit. Both should pick existing models and approaches, including arbitration.
Moreover, the Justice Minister, Dominic Raab, seems to be in favour of an arbitration panel. Each party (UK and EU) would appoint an arbitrator. Once appointed, the two arbitrators would name the third arbitrator.
The arbitration would serve to solve potential disputes that would arise from the new agreements between the UK and the EU after Brexit.