How to add a custom button to the Bitrix admin panel?

Question

1C-Bitrix

In the infoblock, when editing an element, you need to add a button, a link at the end, after all the properties.
https://yadi.sk/i/wtoVw2r2GAR8Lg

Answer 1

option 1) add a custom property, make the output as a button
option 2) Add via JS