Вы можете обернуть их в <div>
стилями grid
.
import jinja2 as jj
t=jj.Template("""
<h3> TITLE </h3>
<style>
div.df > div {white-space: pre-wrap; display: grid;}
</style>
<div class='df' style='display:grid; grid-template-columns: 400px 400px ;'>
<div>{{st | safe}}</div>
<div>{{st1 | safe}}</div>
<div>
""")
t.render(st=st,st1=st1)
![example_output](https://i.stack.imgur.com/y5CWr.png)