Add data to checkout

When filling out a form on my site for contact form 7 plugin, data is recorded in my database using the contact form plugin db.
I wonder how get this data and adds them to the check-out.
I looked for a solution, but can not resolve.
Much success to all who help me.

https://ww.wp.xz.cn/plugins/woocommerce/
https://ww.wp.xz.cn/plugins/contact-form-7/
https://ww.wp.xz.cn/plugins/contact-form-7-to-database-extension/