How to create a custom Allure step function for sensible data

#### I'm submitting a ...
- [ ] bug report
- [x] feature request
- [ ] support request => Please do not submit support request here, see note at the top of this template.

#### What is the current behavior?
With a step decorator like this:

Which takes an element (a text box) and enters the value in it. In the step function I display the value that I want to enter No matter what I enter on the step title, the report always shows the info that was passed as arguments to the function.

My report looks like the following image:

#### If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem
Not a bug

#### What is the expected behavior?
Thus, the "value" argument will always be displayed and that is something that I cannot have on certain projects. I could either use with not showing the value at all or to change it to something like '*****'. Is there anyway to make a custom step function that solves my problem?.

#### What is the motivation / use case for changing the behavior?
I am currently working on a Testing Automation team, using Python and Allure to make reports of all the test cases that we run. Sometimes we deal with sensible data (e.g: passwords) that I can't show directly on the reports due to data protection policies.

#### Please tell us about your environment:

- Allure version: 2.13.0
- Test framework: pytest@3.6.1
- Allure adaptor: pytest-allure-adaptor@1.7.10

#### Other information

[//]: # (
. e.g. detailed explanation, stacktraces, related issues, suggestions
. how to fix, links for us to have more context, eg. Stackoverflow, Gitter etc
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