Is there a way to force line breaks in coefficient labels in latex output from modelsummary?

Inserting a <br> and fmt_markdown will work for gt output, but not when the document is a pdf.

---
title: "Test"
format: pdf

---

```{r}
library(modelsummary)
library(gt)
var1<-rnorm(n=100)
var2<-rnorm(n=100, mean=5)
variable_number_3<-sample(c("red", "blue"), size=100, replace=T)
df<-data.frame(var1, var2, variable_number_3)
mod1<-lm(var1~var2*variable_number_3)
modelsummary(mod1, coef_rename=c("var2:variable_number_3red"="var2\\variable_number_3red"), output="latex")