Using meeting settings in Teams, you can only add organization logo, specific URLs and custom footers below default meeting invite text.
Documentation: Customize MS teams meeting invitations
You cannot fully customize the default meeting invite text from Teams admin center/Microsoft Teams.
However, if you are scheduling meeting from Outlook, you can customize the meeting invite text manually each time you schedule the meeting.
Go to outlook
Click on +New Email dropdown and select Meeting
Click on "Teams Meeting" option at the top. It will add default meeting invite text in email/invitation body. You can then customize the invitation as per your requirements.
At this point you would need to manually edit that text every time a meeting invite has been created. There is no workaround that.
So, if you are scheduling meetings from Microsoft Teams, you can edit your meeting after the meeting invite has been sent out and make required changes manually.
However, I would suggest you to submit a feedback/idea on Microsoft Teams feedback portal and Microsoft may take a look at implementing your idea.
Source: Teams Meeting settings - Change the Teams Meeting invitation text