Hi,

If you are looking to extend the search view from the python code, yes its possible to do it. You can refer this module, which adds a new inherited view in odoo, to add fields to an existing form. By referring this code, you can adjust and make it workable for search view.

Module: https://apps.odoo.com/apps/modules/13.0/dynamic_partner_fields/

Relevant part of code from above module:

inherit_id = self.env.ref('base.view_partner_form')
arch_base = _('<?xml version="1.0"?>'
              '<data>'
              '<field name="%s" position="%s">'
              '<field name="%s"/>'
              '</field>'
              '</data>') % (self.position_field.name, self.position, self.name)
if self.widget:
    arch_base = _('<?xml version="1.0"?>'
                  '<data>'
                  '<field name="%s" position="%s">'
                  '<field name="%s" widget="%s"/>'
                  '</field>'
                  '</data>') % (self.position_field.name, self.position, self.name, self.widget.name)

self.env['ir.ui.view'].sudo().create({'name': 'partner.dynamic.fields.%s' % self.name,
                                      'type': 'form',
                                      'model': 'res.partner',
                                      'mode': 'extension',
                                      'inherit_id': inherit_id.id,
                                      'arch_base': arch_base,
                                      'active': True})
return {
    'type': 'ir.actions.client',
    'tag': 'reload',
}

For inheriting and changing existing search views in Odoo: How To Inherit And Make Changes Inside Existing Search Views In Odoo

Thanks