Request: Provide custom placeholders for masked/blocked elements via masking function

[GxDesign]

Summary

We would like the ability to provide placeholders for masked and blocked elements.

Motivations

In our recordings, its not clear that an image is blocked or that something failed to render, so a placeholder box would be helpful. Additionally, we are a banking platform and masking numbers still provides insight into a customer's balances and transaction amounts, so we've resorted to blocking all money amounts via a selector (which results in a lot of empty space). It would be ideal to provide a masking function or other solution to map a selector like moneyAmount: '********' (fixed number of asterisks).