Export a variable from the function declare onto another script

Question

So, I have the following variables (I am only showing a few of them as there are hundreds..)

> cat variables.txt 

# Saved variables from the script (This file is only for illustration purposes)

br_int0_srxa = br-int0-xa
br_int1_srxa = br-int1-xa
br_int2_srxa = br-int2-xa
{...}
br_int0_srxb = br-int0-xb
{...}
br_wan3_srxd = br-wan3-xd
{...}

Each of those variables were set using the declare function declare br${H}=${br_name}

a.sh

Where:

# This is script a.sh

my_child_function ()

{
# i= Numbers from 0-7
# f= Alternating letters (a-d)
# br_name = the respective name given (This changes on each loop)

# THIS SCRIPT IS IN A LOOP, THAT HOW I GET DIFFERENT VARIABLES
# {START OF LOOP}
H=_int{$i}_srx{$f}
declare b{$H}=${br_name}
export b{$H}=${br_name} ## <<<<<<<<<<<<<< I tried using export to "export" the variable


# Saving the variable into the variables.txt file for illustration purposes
results= b{$H}=${br_name}

# Saving the result into variables.txt
echo $results >> variables.txt

# {END OF LOOP}

var_name=b{$H} # <<<<<<<<<<<<< Only renaming the declared variable
echo ${!var_name}
}

---

The previous script runs when I run main.sh:

main.sh

my_script () 
{
 my_child_function
 sleep 1
 my_child_function2
}

. a.sh
. b.sh

---

b.sh

my_child_function2 ()
{
  echo "This is script b.sh"
  echo ${!var_name}
  echo "End of script b.sh"
}

# Example of output when I run ./main.sh
br-int0-xa
This is script b.sh

End of script b.sh

As you can see I cannot export the variable that was saved using "declare" I tried adding the export function and nothing. I cannot use the variables stored from a.sh onto b.sh