Since this is dingtalk service is not available (yet) through official Franz latest version, You need to put the repo manually under this folder (If this folder is not exist you can create the new one)
~/Library/ApplicationSupport/Franz/recipes/dev/dingtalk
recipes/dev/dingtalk/
- icon.svg
- icon.png
- index.js
- package.json
- README.md
- style.css
- webview.js
Reload the Franz, Open Custom Services, You will see the Dingtalk icon.
icon is taken from