Export to Excel for Related Items of Problem Records

Greetings Cireson Community!

I've been trying to work through a customization and have gotten to the point where I'm not making any forward progress. I'm trying to add 'Export to Excel' functionality to the work items table shown on the Related Items tab of a PR work item. 

I successfully used the customization provided by @Roland_Kind on other pages but this one simply has me stumped. I'm able to successfully add the button just fine but can't seem to get the data to create the .XLSX download as expected. Any help or suggestions anyone can provided would be most appreciated!!!

 

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