Automate adding custom kubernetes node labels to new worker nodes

I would like to customise my kubernetes cluster worker nodes, so that when I add new nodes (via the UI or via the API) they come up with custom node labels. (i.e. the labels that you add for example with “kubectl label node nodenamehere foo=bar”

As a stretch goal of this question, is it possible to customise the image that my kubernetes worker nodes use too? i.e. what if I wanted to add some custom software or configuration settings on my worker nodes? Right now all I see is the option to increase workers in my worker pools and everything below that is hidden. (I’ve had a look through the docs but didn’t see anything that looked like it would help me here).

Thanks!