Assuming your schedule looks like this



Add 2 custom text fields (columns), say Text1 & Text2 and rename them Pred & Succ respectively. Then for these 2 new text fields, add the following formulas, Pred = [Predecessors] and Succ = [Successors]





Your schedule should now show the predecessors & successors in the new columns and crucially, the word days or day is replaced by d.



Now, hide the default Predecessor & Successor columns and your schedule should look like you wanted.



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