You do not have that option for 2018. The new tax laws eliminated personal exemptions for tax years 2018 through 2025, but they might come back in tax year 2026 if Congress renews the Act. Meanwhile, you can still make use of this personal exemption loophole if you go back and amend your 2017 return.
https://www.thebalance.com/can-one-spouse-claim-another-spouse-as-a-dependent-3973983
https://ttlc.intuit.com/replies/3301920
