can not define var in a function in the eof text

[YMC-GitHub]

Expected behavior

expected to ouput:192.168.2.5,192.168.2.5,eth0,eth0

actual behavior

actual to ouput:,192.168.2.5,,

Steps to reproduce the problem

run the code in pm win with git-bash:

PRIVITE_KEY_FILE_NAME=google-clound-ssr
PRIVITE_KEY_FILE_PATH=~/.ssh/
OLD_VM_SSH_SERVER_IP=192.168.2.2
OLD_VM_SSH_SERVER_USER=root
NEW_VM_SSH_SERVER_IP=192.168.2.5
ssh -tt -i ${PRIVITE_KEY_FILE_PATH}${PRIVITE_KEY_FILE_NAME} $OLD_VM_SSH_SERVER_USER@$OLD_VM_SSH_SERVER_IP << EOF
ls
echo $NEW_VM_SSH_SERVER_IP
function hi(){
NET_CARD_NAME=eth0
echo $1,$NEW_VM_SSH_SERVER_IP,$NET_CARD_NAME,${NET_CARD_NAME} #,192.168.2.5,,
}
hi $NEW_VM_SSH_SERVER_IP
EOF

the version of the project, operating system, or hardware

#######on pm######
pm-os:win10 64
git:git version 2.21.0.windows.1
#######on vm######
vm-os:linux centos 64