My plumeria is currently living its dream life under sunny Singapore, blooming and having a gorgeous lush foliage.

Recently, it started developing some strange antennas at the base of its leaves.
I was curious to know if any of you know what they are? I try searching online, but it led to nothing

I can't see the photos well enough to say what they are. A guess would be that it will be growing seed pods! Happy plants do that. It's lucky to be under the Singapore sun! I am just moving my plumerias back outside for the summer here under our New Mexico sun.

Maybe, but aren't the pod seed supposed to emerge from an inflo ?
The small antennas are definitely not inflos, they're really small.

You're right. They can't be seed pods. Keep watch and let us know how they develop. This is something I've never seen on my plants.