JavaScript (Node.js), 62 bytes

//m0()m  ]
//=](=a  )
//>.a>p( )
//mm,m/aa
//[ap./=[
   p  =>p

Try it online!

Improved with a different layout

///// 
///// 
m=>m[ 
0].map 
((a,p 
 )=>m. 
map//= 
  (a=> 
   a[p 
])) 

JavaScript (Node.js), 62 bytes

//m0()m  ]
//=](=a  )
//>.a>p( )
//mm,m/aa
//[ap./=[
   p  =>p

Try it online!

Improved with a different layout

///// 
///// 
m=>m[ 
0].map 
((a,p 
)=>m. 
map//= 
  (a=> 
   a[p 
])) 

JavaScript (Node.js), 62 bytes

//m0()m  ]
//=](=a  )
//>.a>p( )
//mm,m/aa
//[ap./=[
   p  =>p

Try it online!

Improved with a different layout

///// 
///// 
m=>m[ 
0].map 
((a,p 
 )=>m  

.map//= (a=> a[p ]))

JavaScript (Node.js), 62 bytes

//m0()m  ]
//=](=a  )
//>.a>p( )
//mm,m/aa
//[ap./=[
   p  =>p

Try it online!

Improved with a different layout

///// 
///// 
m=>m[ 
0].map 
((a,p 
 )=>m. 
map//= 
  (a=> 
   a[p 
])) 

JavaScript (Node.js), 62 bytes

//m0()m  ]
//=](=a  )
//>.a>p( )
//mm,m/aa
//[ap./=[
   p  =>p

Try it online!

Improved with a different layout

///// 
///// 
m=>m[ 
0].map 
((a,p 
 )=>m. 
map//= 
  (a=> 
   a[p 
])) 

JavaScript (Node.js), 62 bytes

//m0()m  ]
//=](=a  )
//>.a>p( )
//mm,m/aa
//[ap./=[
   p  =>p

Try it online!

Improved with a different layout

///// 
///// 
m=>m[ 
0].map 
((a,p 
 )=>m  

.map//= (a=> a[p ]))