Joplin toolbar customization

Is it possible to add more functionality to it? like adding a button for underline or for making your "marked text" a mhchem code when clicking on it?
S\ce{marked text}S

Yes it's possible to add toolbar items with plugins.
https://joplinapp.org/api/references/plugin_api/classes/joplinviewstoolbarbuttons.html

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thank you, I am not a programmer so I dont know what I have to do?

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In that case you'll have to wait for a programmer to implement it as a plugin.
There is currently an open feature request to re-vamp the template system, I think this kind of feature would fit nicely with that, so this might become possible in the future (without code).

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