Hii,
Option 1: Use Studio to Add a Computed Field

Open the Task form (in Studio).

Click “Add a new field” → Choose "Text".

Click “Advanced Properties”.

Set this as the Python expression:

record.x_studio_employee.values()[0] if record.x_studio_employee else ''

(Replace x_studio_employee with your actual field name if it's different.)

Save and show this field in the list view.

Now when you export tasks, use this new field — it will show just "alia".

Option 2: Create a Computed Field via Code

If you're customizing with code, define a computed field like this:

from odoo import fields, models, api

class ProjectTask(models.Model):

    _inherit = 'project.task'

    employee_value = fields.Char(string="Employee (Cleaned)", compute="_compute_employee_value")

    @api.depends('employee')

    def _compute_employee_value(self):

        for task in self:

            val = task.employee

            if isinstance(val, dict):

                task.employee_value = next(iter(val.values()), '')

            else:

                task.employee_value = val or ''

i hope it is help full