In case anyone else encountered this problem. You have to edit your function and check the "has return value" box. Then your return will work. After this you have to use "Call Function" again and now you have a new field for saving results.
How to Array variable.
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@seven7 You will have to use javascript and the "execute code" action
https://developer.mozilla.org/en-US/docs/Learn/JavaScript/Objects/Basics -

Unfortunately, I don't know how to do it, as shown in the figure, each time the loop variable [[IMAGES_URL]] gets a different URL result.
I want to store these results in a variable like [[RESULTS_IMAGES]] value is https://url1.com,https://url2.com,https://url3.com