find the value of data based on index or column

Question

I have a table with decimal data type whose column consists of z|one|two|three|four|five values.

the z-value column and columns one to nine are inputted from the user, for example I input -3.8 and columns one to nine I fill with 0.0001 then I submit it then the data is automatically saved and displayed in this picture

then I want to find the column value of the z value, for example I want to find the third column of the z value -3.8, by adding the indexm or column value that you want to find, so for example I want to find column 'three' then I write it in the search column like this -3.83, by adding one more number behind the comma.

and the result after searching

how to do it?

This is an example of a website that I want to create, you can try it yourself to better understand what I mean https://setemen.id/project_statistik/tabel

my controller like this

    public function index(Request $request)
    {
        $chi = DataChi::orderBy('id', 'ASC')->get();
        $searchedColumn = null;

        if ($request->has('search')) {
            $input = $request->input('search');

            // Cari data berdasarkan nilai index dari digit kedua nilai Z yang dicari
            $chi = DataChi::where('nilai_z', 'like', '%.' . substr($input, -1) . '%')->get();
            $searchedColumn = $this->getColumnName(substr($input, -1));
        }

        return view('chi.index', compact('chi', 'searchedColumn'));
    }

    private function getColumnName($digit)
    {
        // $digit = substr($input, -1);
        $columns = ['zero', 'one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight', 'nine'];
        return $columns[$digit];
    }

my view like this

   <!-- Kolom Pencarian -->

<div class="col-md-12 mt-3">
    <form action="{{ route('chi.index') }}" method="GET">
        <label for="search" class="form-label">SearchData:</label>
        <div class="input-group">
            <input type="text" class="form-control" id="search" name="search" placeholder="Search data">
            <button class="btn btn-primary" type="submit">Search</button>
        </div>
    </form>
</div>
<!-- Kolom Hasil Pencarian -->
<div class="col-md-12 mt-3">
    @if(isset($chi) && count($chi) > 0)
    <h3>Result Search:</h3>
    @if(isset($searchedColumn))
    <table class="table">
        <!-- Tabel Header -->
        <thead>
            <tr>
                <th>Nilai Z</th>
                <th>{{ $searchedColumn }}</th>
            </tr>
        </thead>
        <!-- Tabel Body -->
        <tbody>
            @foreach($chi as $data)
            <tr>
                <td>{{ $data->nilai_z }}</td>
                <td>{{ $data->$searchedColumn }}</td>
            </tr>
            @endforeach
        </tbody>
    </table>
    @else
    <p>Data not found</p>
    @endif
    @endif
</div>