The supplier shall provide the loading plan upon request by a market surveillance authority. The way to inform the authorities about this loading plan is neither specified by the law nor by EPREL. It is up to each supplier to express it in terms of 'Data Type'.
In practice, this information can either be available by: writing to the contact email address provided by the supplier, clicking a weblink where to download the relevant data, clicking the link to the user manual in which the relevant data is available or by checking the compliance part of EPREL in situations where the supplier has made it available as additional information.
Disclaimer: Please note that the European Commission cannot provide a legally binding interpretation of the EU legislation, as this is the sole competence of the European Court of Justice. Any remarks from the European Commission services are without prejudice to the position the Commission might take should related cases arise in a procedure before the Court of Justice.