Dual Sim on an iPhone 12 mini

Dual SIM iPhones with two SIM cards are only sold on some models in some locations. See the following from Using Dual SIM with two nano-SIM cards - Apple Support

In China mainland, Hong Kong, and Macao, iPhone 12, iPhone 12 Pro, iPhone 12 Pro Max, iPhone 11, iPhone 11 Pro, iPhone 11 Pro Max, iPhone XS Max, and iPhone XR feature Dual SIM with two nano-SIM cards. This gives you two phone numbers to make and receive calls and text messages.

and

If you purchased an iPhone 12 mini, iPhone SE (2nd generation), or an iPhone XS in Hong Kong or Macao, learn how to use Dual SIM with an eSIM.

I don't know for certain but I suspect not -- it isn't mentioned in the following from Using Dual SIM with an eSIM - Apple Support

To transfer your eSIM to your new iPhone, you can scan the QR code your carrier gave you, use your carrier's iPhone app, or install an assigned cellular plan*. When your cellular plan is activated on your new iPhone, the plan on your previous iPhone will deactivate.

To set up your new iPhone, follow the steps in the Set up your cellular plan with eSIM section. If you're asked to "Transfer Cellular Plan" during Quick Start setup, follow these steps.