Custom training data for RGCN-with-BERT

[AlanQuille]

Hi all,
I was wondering if it is possible to use custom data that one can prepare themselves for training this model. If so, how does one do this with RGCN-with-BERT? Will it convert a txt file to the right format or does one have to convert it to a ConLL file first? Can it be ConLL-U? Thank you very much.