how to create report in one2many field in odoo
<tr t-foreach='o.subname' t-as='line'>
<td><span t-esc="line.subjname"/></td>
<td><span t-esc="line.mark"/></td>
<td><span t-esc="line.branchmark"/></td>
<td><span t-esc="line.max_mark"/></td>
<td><span t-esc="line.marks"/></td>
</tr>