data, sdata and reserved parameters in Office-ATP-Safelinks

[Jan_F1801]

We have received a request from a "worried" user.
With us, links are converted into mails by ATP. So the users get links like:
https://eur04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgetsupport.atlassian.com%2Fservice...

That this is a security feature is quite clear. But what is behind the "data", "sdata" and "reserved" parameters that are integrated into the link?
What is this data needed/used for?

Some of our Users are worried that they can be tracked through these parameters.

[#2]

C'mon Microsft. Someone will have to be able to tell you how such a link is assembled.

[#3]

@Pernille-Eskebo Knowing this information would help a lot of security teams across the world.