Need syntax in batch to concat %var_1% and "VarText" eg Dir *.Jpg > %%Var_1 + filenam.txt : Goal: In a batch file, append or concatenate the text in Var_1 with the string "JpgList" and add the extension .txt to the output file

In the batch, Dir *.Jpg > JpgList.txt works.

In the batch, I have already retrieved a Variable %Var_1%
Problem is: concatenating the Var with the literal string "JpgList" and appending .txt as the output filename.

Here are code examples of what I have tried along with pseudo code that fails
Some produce a .txt file with no name
some produce nothing
some produce a file with the Var_1 name, but no content in file

dir *.jpg Var_1 + jpgList.txt

dir > %label_% >>".txt"

dir > %%label_%% >>".txt"

etc

I have tried every which way but upside down to put this together, and
appreciate any tips or syntax for making the code work.
Thanks