from the linked website:

Ask you government to call on the European Commission to withdraw the chat control proposal. Point them to a joint letter that was recently sent by children’s rights and digital rights groups from across Europe. Click here to find the letter and more information.

one paragraph below that:

When reaching out to your government, the ministries of the interior (in the lead) of justice and of digitisation/telecommunications/economy are your best bet. You can additionally contact the permanent representation of your country with the EU.

the bold parts are clickable URLs in the original text.

Is there was such a pdf, your government already received it. You writing in your own words is unique

Not necessarily the best idea. My representative went on national television accusing bots of spamming her email, even though every single one of those probably was a person using some template that was provided. Those forms go straight into trash unfortunately. Best to use them as a guideline and write your personal concerns instead.

Alternatively, ChatGPT. No idea if it works, though.