Text question needs character counter to warn when approaching the character limit

Posting here since https://microsoftforms.uservoice.com/forums/386451-welcome-to-microsoft-forms-suggestion-box/suggestions/43699461-text-question-needs-character-counter-to-warn-when is going away:
The Text question type in MS Forms has a 4000 character limit.
It does not warn the respondent when they are approaching the limit; it just stops accepting additional input.
A character counter below the text box would therefore be very useful. It could either show the remaining characters or the ratio of characters entered/total (see mockup screenshot showing examples of both).