Azure Data Factory LOOKUP possibilities - azure-data-factory

Question

I'm trying to add a lookup activity that will look up a series of values(companyIds) and insert the values into here
["/apiCore/api/countries","/apiCore/api/Metrics/MyLookup"]
At present my configuration looks like the following:
I was wondering if it was possible to add Lookup activity to insert the values as follows:
And then enter a parameter like #activity('MyLookup').output.value to:
["/apiCore/api/countries","/apiCore/api/Metrics/MyLookup"] so it change to:
["/apiCore/api/countries","/apiCore/api/Metrics/** #activity('MyLookup').output.value**"]
Can someone let me know if the above would work? If not, do you have any suggestions?
I got the answer to my suggestion with the following error:
{
"errorCode": "2200",
"message": "ErrorCode=HttpRequestFailedWithClientError,'Type=Microsoft.DataTransfer.Common.Shared.HybridDeliveryException,Message=Http request failed with client error, status code 400 BadRequest, please check your activity settings. If you configured a baseUrl that includes path, please make sure it ends with '/'.\nRequest URL: https://pm2.preqinsolutions.com/apiCore/api/Metrics/#activity('MyLookup').output.value.,Source=Microsoft.DataTransfer.ClientLibrary,''Type=System.Net.WebException,Message=The remote server returned an error: (400) Bad Request.,Source=System,'",
"failureType": "UserError",
"target": "dynamoCompanies",
"details": []
}
You will notice the error is with:
#activity('MyLookup').output.value
here:
https://pm2.preqinsolutions.com/apiCore/api/Metrics/#activity('MyLookup').output.value.,
Any suggestions will be very much welcomed
Updated question

Answer 1

Using string interpolation, you can build the URL by adding the output of look up activity. Instead of using the URL as https://pm2.preqinsolutions.com/apiCore/api/Metrics/#activity('MyLookup').output.value, you can try the following:
I have taken a sample lookup which gives the following output:
Now, I have used a variable to build the URL value. I have taken the value /apiCore/api/Metrics/ in a parameter called relativeURL.
https://pm2.preqinsolutions.com#{pipeline().parameters.relativeUrl}#{activity('Lookup1').output.value}
This generates the required URL. When I call it in web activity, you can see the URL that is being passed in debug input (I don't have access to the activity fails).