Hanafi
The sources give no view for it here.
فداء الأسير
هل يجوز فداء الأسرى بمال أو بأسرى مسلمين؟
Each school’s answer
In our wordsHanafi
Not stated in the sources
Maliki
Not stated in the sources
Shafi'i
Not stated in the sources
Hanbali
Not stated in the sources
The texts
فصل: ودليلنا على جواز الفداء، الظاهر، وما فعله النبي صلى الله عليه وسلم بأسارى بدر من إطلاقه إياهم على مال، ولأنه صلى الله عليه وسلم أطلق أسيرا من [بني] عقيل وفادى به رجلين من أصحابه كانا أسيرين في ثقيف.
«الإشراف», al-Qadi Abd al-Wahhab p. 933
From the schools’ own books
Maliki
The sources give no view for it here.
Shafi'i
The sources give no view for it here.
Hanbali
The sources give no view for it here.
What is «in our words» is our standard wording; the books’ texts stay as they are.