Multi-Entity in custom field

Hello, i'd like to link a PublisedFile into a custom field.

Here's the information i found:

Note: For more complex field types (such as entity and multi entity links), you need to set up creation via the post-install hook instead. (The post install hook is a special hook which runs at installation time and allows you to execute arbitrary code as part of the app installation process.)

How can i setup that post-install hook?

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