Indeed, I saw this plugin. But 49 euro for a plugin that I would use once in the end seems a little excessive. Especially for options that should be native to WooCommerce.
Because even if the fields majotité a client form is common to all trade, adaptation and management is unique to each business. So manage the client form should not be an option (in plugin) but a basic function.
So if there is no other way a plugin, I think point me to another solution that WooCommerce.