You would do this with JAMF sites, but it is probably more work then its worth.

Sites - Jamf Pro Administrator's Guide | Jamf

Hey @DenisT ! You could use an EA to determine the computer's country based on IP, or you could grab the set locale information to determine. 
Country By IP (VPNs could give inaccurate results, just FYI):

Apple Locale Information (User's could have chosen an inaccurate region during Setup Assistant, FYI):

#!/bin/bash

# Determine user location based on region selected during Setup Assistant
# @robjschroeder 08.01.2023

# Gather the logged in User
loggedInUser=$( echo "show State:/Users/ConsoleUser" | scutil | awk '/Name && ! /loginwindow/ { print $3 }' )
# Determine locale
locale=$(defaults read /Users/$loggedInUser/Library/Preferences/.GlobalPreferences.plist AppleLocale)

echo "<result>$locale</result>"

Hey @DenisT ! You could use an EA to determine the computer's country based on IP, or you could grab the set locale information to determine. 
Country By IP (VPNs could give inaccurate results, just FYI):

#!/bin/bash
# Gathers the country of the computer based on IP address
# Created 10.27.2022 @robjschroeder
jamfURL=$(defaults read /Library/Preferences/com.jamfsoftware.jamf.plist jss_url)
externalIP=$(curl -s ifconfig.me)
geoData=$(curl -s -H "User-Agent: keycdn-tools:${jamfURL}" "https://tools.keycdn.com/geo.json?host=${externalIP}" 2>&1)
if [[ $externalIP ]]; then
geoData=$(curl -s -H "User-Agent: keycdn-tools:${jamfURL}" "https://tools.keycdn.com/geo.json?host=${externalIP}" 2>&1)
# echo $geoData
country=$(echo ${geoData} | plutil -extract "data"."geo"."country_name" raw -o - -)
else
RESULT="Error - IP Address lookup failed"
fi
if [[ ${country} ]]; then
RESULT=${country}
fi
echo "<result>${RESULT}</result>"

Apple Locale Information (User's could have chosen an inaccurate region during Setup Assistant, FYI):

#!/bin/bash

# Determine user location based on region selected during Setup Assistant
# @robjschroeder 08.01.2023

# Gather the logged in User
loggedInUser=$( echo "show State:/Users/ConsoleUser" | scutil | awk '/Name && ! /loginwindow/ { print $3 }' )
# Determine locale
locale=$(defaults read /Users/$loggedInUser/Library/Preferences/.GlobalPreferences.plist AppleLocale)

echo "<result>$locale</result>"

 

two liner.. but many ways as ever.. 😎

Nice! 

I think Sites is the way to go here.