How to change China Mobile in the upper left corner of Huawei's mobile phone screen to custom?

Huawei mobile phone does not support custom operator name, but only supports hiding/displaying operator name. The operation path is:

EMUI 3. 1:Settings >； Set all > display > display the operator's name and turn it on/off;

EMUI 4.0: Settings > Notification Bar and Status Bar > Display Operator Name, just turn it on/off.

EMUI 5。 X: Settings > Notification and Status Bar > Display the name of the operator, just turn it on/off.

EMUI 8.0: Settings > Applications and Notifications > Notifications and Status Bar Settings > Display Operator Name, just turn it on/off.