IS THIS DEVICE SUPPORT E SIM

Re : I own 12pro but e sim option is not available in my device, does it support or not

Whether or not you can use eSim may depend upon where you live, and your service provider.

Apple Support's online article: About eSIM on iPhone - Apple Support

says:

"What you need

• An iPhone XS, iPhone XS Max, iPhone XR or later
• A wireless service provider or worldwide service provider that supports eSIM
• Your new iPhone needs to be connected to a Wi-Fi network.*

"eSIM on iPhone is not offered in China mainland.

In Hong Kong and Macao, some iPhone models feature eSIM. 

Find out about using Dual SIM with two nano-SIM cards in China mainland, Hong Kong and Macao. 

For people visiting China mainland who want to use an eSIM for prepaid data plans, these are offered by many worldwide service providers".

There is much more info. in Apple support's article (link at the top), including "How to set up an eSIM on iPhone"