Making a spousal IRA contribution does not require that any contribution be made to an IRA of the individual with the supporting compensation. It only requires that your spouse be eligible to make the IRA contribution (for a traditional IRA contribution for 2019 that means being under age 70½ in 2019; the age limitation has been eliminated for traditional IRA contributions for 2020 and beyond), you having sufficient compensation to support the contribution and filing a joint tax return.
Note that even though your compensation is being used to support your spouse's contribution and you might be the one making the deposit, it's technically your spouse's contribution.