backquote cannot be processed well

[dakylin]

I would like to use backquote in the bash file. The extension cannot process backquote very well.
E.g. My shell is like this:
STATUS=splplus -s $SCHEMA/$PASSWORD@$SID << EOF..... select status from myStatusTable where date='20191102'; exit EOF
echo $STATUS
The latest line was processed as the content in the ``