I've tried several times but it isn't forseen to bind an instance number to a node. The reason seems to be that if you have several nodes (in my environment I had 4 nodes in one cluster) it doesn't make sense to bind the number to the node.
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Maybe you can do an online relocation:
srvctl relocate database -d RACONE -n node1
srvctl relocate database -d RACONE -n node2 -w 10 -v
If you use an online relocation it will be transparent for your application if you have to move your instance from one node to the other.
I hope this helps you