Noob question: Sorting a hasMany column in table

I'm really struggle sorry and I am sure it is dead easy to do.
Apologies, I know I've asked a bunch of relation questions, but that seems to be where stuff explodes for me.

What I am trying to do:
I need the HIndex column in the Activities table to be sortable based on the related HIndex with the highest year value (or based on the formatted state would be even better)

Model Activity:

has many HIndex via

public function hIndices()
  {
      return $this->hasMany(HIndex::class)->orderBy('year', 'desc');
  }

public function hIndices()
  {
      return $this->hasMany(HIndex::class)->orderBy('year', 'desc');
  }

public function hIndices()
  {
      return $this->hasMany(HIndex::class)->orderBy('year', 'desc');
  }

public function hIndices()
  {
      return $this->hasMany(HIndex::class)->orderBy('year', 'desc');
  }

Model HIndex :

Belongs to one Activity
Has the columns
-- year
-- value
-- activity_id

In the Activity resource I have:

TextColumn::make('hIndices.value')
->formatStateUsing(function ($record) {
// ... some stuff dont worry about it
}
->sortable(),

TextColumn::make('hIndices.value')
->formatStateUsing(function ($record) {
// ... some stuff dont worry about it
}
->sortable(),

TextColumn::make('hIndices.value')
->formatStateUsing(function ($record) {
// ... some stuff dont worry about it
}
->sortable(),

TextColumn::make('hIndices.value')
->formatStateUsing(function ($record) {
// ... some stuff dont worry about it
}
->sortable(),

But it throws:
SQLSTATE[21000]: Cardinality violation: 1242 Subquery returns more than 1 row

Noob question: Sorting a hasMany column in table

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