12*100 to 15*100 thru axle

Hoping someone can help.

I have a pair of wheels which has 12mm thru axle.
I want to fit them on another bike I have but that bike has 15*100 at the front.
What do I need in order for this to work? Is it even possible?
I can't use the existing 15mm thru axle as it won't fit the 12mm hubs...

Appreciate any help!