@bb1's solution works great and answers the question, and I wanted to add details for future visitors by LaTeX users:
| Input String | Output String | Purpose |
|---|---|---|
f"{{value}}" |
{value} |
Escapes {} for literal braces |
fr"$x^{{2}}$" |
$x^{2}$ |
LaTeX grouping braces |
fr"$x^{{{value}}}$" |
$x^{2}$ |
Dynamic Python value inside LaTeX |