Can i change existing system components?
E.g.: Project components tab - create new component - i need to add few custom fields here (index, config, etc...)
Because in plugin modules i didnt find something similar
What you describe is a customization of JIRA, probably best avoided.
Have you not considred just contributing a new addon with what you need, like a Complex Component Custom Field? That way, your edit time view can be more complex, with config, and your runtime view can be the output of the config, i.e. presented in a simpler way.
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