[keystone] how to write a plugin?

Hello community, Please help me to figure out how to write a plugin for keystone to modify the current functionality. I planned to create a middleware, but found that the paste was removed in Rocky and now Keystone uses the hard-coded list of middleware/apps. I need to call an additional script/api when creating a domain or a project. Is it possible to implement this without patching Keystone? -- Sergey Vilgelm https://www.vilgelm.info