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SCHEDULE_ROWS => [
    {
...
        ],
    },
]

SCHEDULE_ROWS => [
    { SCHEDULE => 'value' },
    { SCHEDULE => 'value' },
]

$data_structure{SCHEDULE_ROWS} = \@schedule_rows_loop;
$data_structure{SCHEDULE_COLUMNS} =\@schedule_columns_loop;

SCHEDULE_ROWS => [
    { SCHEDULE => 'value' },
...
    { SCHEDULE_COLUMNS_COUNT => 'value' },
    { SCHEDULE_COLUMNS_COUNT => 'value' },
]

<TMPL_LOOP NAME=SCHEDULE_ROWS>
    <tr>                    
...
        <td><TMPL_VAR NAME=SCHEDULE_COLUMNS_COUNT></td>
    </tr>
</TMPL_LOOP>