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How to set earliest and latest time based on timestamp minus/plus a static time?

Engager

I know there are some similar questions asked and I've read through them, but none quite gives what I want.

Here is my problem:
I have one dashboard with several panels. On one of the panel which is a timechart, I have set the token to be the timestamp when the user randomly click on the chart. What I want to to achieve is that when the user click on the particular timestamp, another timechart on another panel should change the display to +/- 1 hour from the timestamp.

I know that the earliest and latest can be set to timestamp, but how to make them become +/-1 hour from the token value, like this:

<earliest>$timestamp$-3600</earliest>
<latest>$timestamp$+3600</latest>

But this does not work, so I am wondering whether is there any way for me to do it?