Hello @dpowyslybbe, @Haystack, @rafaelesanto83 and other Power BI users,
with new KNIME version 4.4.0 Send to Power BI node has been enhanced with possibility to define relationships. Additionally it has been moved out of Labs. Give it a try and as always feedback is welcome!
Check out here for more together with list of other nodes moved out of Labs:
Br,
Ivan