Placeholder text inside input field

## Is your feature request related to a problem? Please describe
> A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]

I would like to add placeholder text on an input field.

## Describe the solution you'd like
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The ability to add placeholder text to text input fields.

## Describe alternatives you've considered
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Considered description texts on the fields, but it does not seem fitting for small examples of what the field should contain.

## Additional context
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The kind as described here: https://www.w3schools.com/tags/att_input_placeholder.asp
Or an equivalent.