Allow NRT field to display HTML markup

Problem/Motivation

In the previous version 8.x-1.11 I used to modify the template reading-time.html.twig to show a small icon next to the minute, eg:

<div class="time-wrapper">
<div class="time-icon"><a class="icon">AD</a></div>
<div class="time-read"><a class="minutes">{{ reading_time }}</a></div>
</div>

But now in the node view manager the NRT field format has plain text by default.
Is there any way to change or implement this to have a themed field?

Many thanks for your interest

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes