pytest-bdd doesn't parse a scenario ourline parameters. 

Example:
Feature: Some Feature
Scenario outline:
  Given: One Param <param_1>
  When: We add another param <param_2>
  Then: we get <result>

Examples:
|param_1| param_2 | result |
|1            | 2             | 3       |
| 3           | 2             | 5       |

Allure report contains only steps without parsed parameters there