I'm designing a schematic and board in Eagle 9.4.0. I have couple different power nets: signal 5V, power 5V (for servos) and power 8V (from battery). I'd like the power nets to be wider than others, so I designed specific net class for them. Matching GND nets will also be wider than others.

The problem is that I want all GNDs to connect at some point. However, when I connect nets (for instance, using a net junction), Eagle asks me, whether I want to merge nets and this is not what I want to do, since I'll have to choose one of two net classes for merged net.

How can I merge two nets in Eagle?