Hi,

You can create a compute(or write value to the field in onchange)  Boolean field in the corresponding model and using this field value you can make the other field invisible.

role = # your role field definition
hide = field.Boolean(string='Hide', compute="_compute_hide")

@api.depends('role')
def _compute_hide(self):
    # simple logic, but you can do much more here
    if self.role == 'testrole':
         self.hide = True
    else:
         self.hide = False

Then in the XML,

<field name="fieldToHide" attrs="{'invisible':[('hide', '=', True)]}" />

See this sample here: https://stackoverflow.com/questions/38127562/hide-field-odoo-in-python-onchange-method

Thanks