How to add the values of a common field to a field during union

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If I have say 3 overlay features; A,B,C each has a field called FIELD_ID

If I do a union, I will get 3 new fields in the output: FIELD_ID_1, FIELD_ID_2, FIELD_ID_3

But how do I get just one summary field 'FIELD_SUMMARY' that contains the values of FIELD_ID_1, FIELD_ID_2, FIELD_ID_3 for each polygon?

I'm essentially asking how list the values of [FIELD_ID] for features A,B and C that occur from the union but in a single field, not multiple ones?

I'm aware that I can do a field calculation after the union that will concatenate values from FIELD_ID_1, FIELD_ID_2, FIELD_ID_3 etc, but that seems a bit long winded



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