For your second question read this post from @Fox ,
maybe its what you need. Its in Russian, but you can
use translator. There is an example script too >
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