How to add icons for toolbar commands without existing icons?

I wish to improve my current icon theme. I’d like to add some new icons for commands without existing icons (eg. 150% zoom) on the Theme so I can share its improved version.

I’m not looking to modify icons on my current installation (eg. Modify > Change Icon).

I’ve tried creating a new icon using the .uno ID of the command. For example, there’s currently an icon for “.uno:Zoom100Percent”. Its file name is sc_zoom100percent.png or lc_zoom100percent.png depending on its size.

I’ve tried doing the same for the “.uno:Zoom150Percent” command, by using the name sc_zoom150percent.png / lc_zoom150percent.png.

However it doesn’t appear on the toolbar.

Anyone knows if it’s possible ?

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