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Putting custom state text list as parameter in get-request

Hey there!
I have a custom state which is datatype text and a list. Now I want to send this custom state as a parameter with a GET to an API. The problem is it always just sends only one string with all the values of the custom sate and not an array of strings to the API endpoint.
Do I have to format the custom state in some way in order to make it a viable array of strings that can get as a parameter via the GET-request?

Thanks in advance for any help!