Set index setting like unassigned.node_left timeout from ILM

I wonder, is there a way to apply settings to indices when transitioning betwen ILM phases?

My motivation is that I would like my cold indices to have longer index.unassigned.node_left.delayed_timeout than the hots and warms, because my cold nodes take like 10 minutes to reboot and their network traffic is also more expensive.

The natural way would be to set the normal timeout in index template and then have ILM change it when transitioning to cold, but I don't see any way to do this.
Please, can you confirm that is not possible?

Thank you

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