JSFiddle - React, Tailwind, and code Playground

HTML

<br />Формула: 
    <span class="formula">O<span><sup>0</sup><sub>2</sub></span></span> текст после формулы
<br />

CSS

.formula span{
    display: inline-block;
}
.formula sup, .formula sub {
    display: block;
    font-size: 75%;
    position: relative;
    top: 0.5em;
    vertical-align: baseline;
}