Allow to save a HTML component in the library with contextual attributes

Description 

We have a front-end developer who is developing e-mail blocks in HTML that we save in the Adobe Library. This is a nice function because this makes it easier the re-use components of an e-mail.

Unfortunately, it is not possible to add it to the library with a contextual attribute in it. I understand that I can't use a field that belongs to a specific event in e-mails with other events, but still, I would like to save it.

Now our front-ender is creating the HTML components, but then the marketers still need to add the contextual attributes manually. This takes a lot of extra time and is more sensitive to errors.

So my request: I would like to save HTML components WITH contextual attributes.

Why is this feature important to you: to easily build new e-mails and edit existing ones without making mistakes or spending a lot of time again. 

How would you like the feature to work:  I would like to save HTML components WITH contextual attributes.

Current Behaviour: you can't save HTML components with contextual attributes.