https://ibb.co/sb4mR8M ======> Link for the Photo

Hi, 
you can add a compute field that takes 'Resident' if boolean Is True and 'non resident' if False 
then in your pivot, you consider the new field, not the boolean. 

field1 = fields.Char(string='Resident', compute='compute_resident_char', store=True)
@api.multi
@api.depends('resident')
def compute_resident_char(self):
    for rec in self:
        if rec.resident:
            rec.field1 = 'Resident'
        else:
            rec.field1 = 'Non resident'
 

If you already have records in your DB, you would think to launch a xmlrpc call to recompute this new field for all records so it gets updated.

Upvote if this helps. If not, you can write back for further analysis. 

Regards.