Tooltip method 1: Additional information before the form control, but inside label
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If the additional information is critical and needs to be programatically associated with the form control, it may be best placed inside the label, or associated via an aria-describedby attribute.
Example
Markup
<div class="form-container">
<label for="hint4">
<span class="label-content">
Active customers
<a href="#" class="tooltip" role="button">
<span class="tooltip__content">
<span class="hidden">is defined as </span>The maximum number of active customers across a given month.
</span>
</a>
</span>
<input class="form-input" id="hint4" type="text">
</label>
</div>