Hanafi
The sources give no view for it here.
الجُعل على الرقية
هل يجوز أخذ الجُعل على الرقية؟
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
أَخْذُ الْجُعْل عَلَى الرَّقْيِ: ٣ - ذَهَبَ جُمْهُورُ الْفُقَهَاءِ إِلَى جَوَازِ الْجُعْل عَلَى الرَّقْيِ عَلَى تَفْصِيلٍ (سَبَقَ فِي بَحْثِ تَعْوِيذ مِنَ الْمَوْسُوعَةِ ١٣ / ٣٤) .
«الموسوعة الفقهية الكويتية» (Kuwait) entry «رقية» vol. 23 p. 98
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.