Simply do a Do a search to get all of your product and on it use format_as_text this will give you a box with two inputs one is for each thing and the other is for delimeter.
inside the thing put your product id as below:
{
“displayId”: this product _id
}
and on delimeter put a comma ,
Note: Your are sending a list of id as object. so wrap your entire Do a seacrh: Format as text with [] like below
[Do a seacrh: Format as text]
this is what it look like on the parameter you sending it will be a list of text and each text is exacly an object wiht one parameter as displayID with a ID