What is the where clause when you are using 'Selected features' on the input data?
When I use queryParameters={"where": "objectid = '{objectid}'" it only shows one item, even when I select mutiple.
I would like to use the feature report rest api with multiple selection like the widget below:
It sounds like you are looking for a "IN" statement for your query?
search "[NOT} IN"
I tried to use IN but I am not sure how to add those as a variable in the clause, as you can see it gives you the option of Selected features, then fields, but I don't know what that actually looks like when the variable is generated. In other words, what does {objectid} equal when Selected features is selected?