The Form 8379 Injured Spouse Allocation can be filed electronically with your tax return when you are using TurboTax to e-file the return.  You must be completing your tax return using the Married Filing Jointly tax status when e-filing.

See this TurboTax support FAQ for a Form 8379 - https://ttlc.intuit.com/questions/1910698-how-do-i-file-form-8379-injured-spouse-allocation

For a mobile app - https://ttlc.intuit.com/questions/3191959-how-do-i-file-form-8379-injured-spouse-allocation-in-the-m...