Bad default formatting of numeric values in annotations

[OLarionova-HORIS]

Example:

data = {
    'name': ['a', 'b', 'c'],
    'value': [10**(-5), 3*10**(-5), 6*10**(-5)]
}

ggplot(data) + \
    geom_pie(aes(fill=as_discrete('name', order_by='..count..'), weight='value'), 
                      labels=layer_labels().line('^slice'))

Expected:
like in the tooltip - e-notation (3.000e-5)