Change Implementer role missing from view columns

Change Implementer role missing from view columns

I am attempting to create a new view in the Changes area of SD+ cloud. My intent is two-fold:
1. Create an "All approved Changes" view with a column that shows the implementer role
2. Create a "My Changes" view that shows only approved changes where I am listed as the implementer.

When trying to create either of those items I'm unable to see the 'Change Implementer' as an available option for columns:
I see owner, manager, and requester but no 'implementer' role.

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