Selecting bones by selecting mesh area

Artistic Support Animation and Rigging
1

Hi, how do I select a bones by selecting on the mesh over the weight map like in akeytsu?
I added a video on youtube to show you.
https://youtu.be/Bk1mjNijolo

2

I found something of what I wanted, but it’s not free.
https://blendermarket.com/products/skin-selection
https://blendermarket.com/products/skin-selection

3

There’s not a native way to do this, so your only option is add-ons. If it’s really important to you, 10 dollars shouldn’t be too hard to save up