Where can I set the shark expression?

Hello, I have set an expression that imitates me in the interface of sending information.

Taking iPhone 12 as an example, the steps of setting mimetic expressions are divided into four steps. The specific operation is as follows: 1. Click on the character icon. In the Send Message interface, click the character icon at the bottom. 2. Choose to continue. In the expanded mimetic expression interface, click the bottom to continue. 3. Click the plus sign. Click the plus sign in the mimic my expression interface. 4. Choose to start using. Click the bottom to start using it in the mimetic expression interface.

Imitating my expression is an application function of Apple mobile phone, but ordinary Android mobile phone does not have this function.