Hello and apologies for this newbie question.
I have a three way switch that controls recessed lights in an extension through a wall, one three way switch inside (basement) one three way switch outside (extension).
Outside (in the extension) I have a two gang box where the power source comes in and provides the power to the common and then the travellers for the three way switch inside (diagram explains it best):
What I'd like to do is to add a separate single pole switch together with the first three way in the attached diagram, that controls a separate set of recessed lights daisy chained with 2 wire Romex.
I've seen it done where the layout is three way switch to three way and then lights but this is slightly different.
For the life of me I can't figure out how to have my hot and neutral available to the single pole switch to control the second set of lights independently.
Again, sorry if this is too basic. Appreciate any help and guidance.
Edited: Adding a bit of context: