$bid_allowed_fields[$field_name]=t('Field name "@field_name" (@field_label)',['@field_name'=>$field_name,'@field_label'=>$field_definition->getLabel()]);
}
}
$form['commerce']['bid_amount_field_name']=[
'#type'=>'select',
'#title'=>t('Bid amount field'),
'#description'=>t('Pick field that should be used as source for the commerce price amount.'),
'#description'=>t('When there is no customer for placed bid (for example, it was placed as anonymous), it is common to ask for an existing user or a new one. This option is to allow adding bid to the cart to a different user account, no matter if bid was placed as a logged-in user.'),