Workout specification: HTML tags?

Hi,

is there a way to add comments to a workout description that are kept internal and not forwarded to devices?

For example, I would like to store something like this inside the workout description:

<!-- pk_steps_start -->
- 3m 50% 90rpm
- 3m 59.3% 90rpm
- 3m 68.6% 90rpm
- 3m 77.9% 90rpm
- 3m 87.2% 90rpm
- 3m 96.5% 90rpm
- 3m 105.8% 90rpm
- 3m 115.1% 90rpm
- 3m 124.4% 90rpm
- 3m 133.7% 90rpm
<!-- pk_steps_end -->

This works well in the normal workout view because the HTML comments stay invisible, which is exactly what I want.

However, it seems Garmin has a problem with this. On my Edge 1040, after the first HTML comment, the workout is no longer displayed correctly.

So my question is:

Is there a supported way to store hidden metadata or comments in a workout description without sending them to devices like Garmin?

Thanks!

I think there is a format like this:

Category: xyz

which seems to do something if it is a Zwift workout. Since Garmin has nothing like it, maybe intervals either ignores those lines when building the Garmin FIT file, or the device ignores it later. Worth a try?

@R2Tom inform me, that he update later the:
Intervals.icu Workout Builder Syntax Quick Guide

Then there are some text markdown styles