Autofilling it this way:
@api.model
def _get_default_product_variant_ids(self):
return self.env['hotel.employeetasks'].search([]).ids

product_variant_ids = fields.Many2many('hotel.employeetasks', string='Variants',
default=_get_default_product_variant_ids)

The reason why I want this way is because I have a model called "hotel.employeetasks" which holds some records and I have another model called "hotel.dashboard". In the "hotel.dashboard" I want to display 5 records from "hotel.employeetasks" model and only three fields need to be displayed like "today", "nameofemployee" and "task".

So the way I have thinking about it is making related fields in "hotel.dashboard", so
field1 = field.Char(related="task_ids['first record'].task")
field2 = field.Char(related="task_ids['second record'].task")
etc...