outreg2: adding string to single excel cell

[Paula de Souza Leao Spinola]

I am trying to add a string test to outreg2 but the text is breaking into different cells or part of it is disappearing.

More specifically, the text I want to add is a confidence interval from another estimator which I generated separately and saved in a local macro

[ 2.74571, 5.75474] 

Below is the code where I try to add this range to outreg2.

sysuse auto, clear

local add_range = "[ 2.74571, 5.75474]"

reg price weight

outreg2 using "test.xls", excel nocons replace addtext(t1, `add_range', t2, "`add_range'", t3, ""`add_range'"")

This is what I get

I would like to get this