Yes, since the form indicates you may allocate this amount anyway you like, one spouse can take 100% of the deductions.
DC Schedule S page 2 Calculation J Tax computation for married or registered domestic partners filing separately on the same DC return. Line F Deduction amount. "Enter each person’s portion of the amount entered on D-40, Line 16.
(You may allocate this amount as you wish.)"
https://otr.cfo.dc.gov/sites/default/files/dc/sites/otr/publication/attachments/48364_D-40%20BOOK%20...