Recycling Runes before Jhin Legend Ability Triggers? | tcgmode

In a scenario where I have 12 runes available, and I decide to play the 4th spell with energy cost 4 or more, am I allowed to wait for the spell to resolve, recycle 4 runes to float 4 power, and then activate the Jhin legend ability to channel 4 runes? This way, it would allow me to have 4 power ...