I have hunted around a bit and only found how to setup the site search parameter in a site's admin section. This is not what I want. Also looked through some Google Search Console videos - no go.
Given a URL, https://somesite.com/redirect/?redirect=https://gofundme.com/somecampaign/.
As some background, what I have setup here is a simple page that says "Loading..." and is used for external links I want to track analytics on, from platforms that I may not have access to the link's analytics. For example: https://gofundme.com/somecampaign.
Rather than having a redirect setup on the page itself, I injected custom JavaScript through Google Tag Manager that records analytics data in Google Universal Analytics (anyone want to recommend how to do this in G4A?) then performs the redirect.
My question is, in Google Analytics, how do I setup a custom report where the query string parameter = redirect and/or the specific page URL?
Thanks.