How to set a default value for item class attributes?

Each item class has attributes and I would like to set it so that when I add a new item and select a specific item class, the attributes have default values ​​automatically. I'm mainly concerned about the checkbox, one of the attributes has a type Checkbox and when I add a new item of a certain item class, the checkbox is by default without a checkmark in it. But I want it to be checked by default. Can someone tell me how to achieve this?