Mahmoud M. AlSaadi reminds us of the new Dynamics GP 2018 – Power BI Content Pack.
Belinda Allen at njevity seems to be well ahead of the Microsoft team when it comes to GP content packs with her work on PowerGP Online.
Dynamics GP 2018 – Power BI Content Pack
Reporting & BIGP 2018
Archived post from 2018. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.