There is a category that groups time, space, and matter together. This category is called "substance" or "substantivalism." I am wondering if there are speculative ideas of something as fundamental as time, space and matter that may not exist in our universe, but may exist elsewhere.
In speculative scenarios, it is challenging to determine definitively what could be as fundamental as time and space in other universes, precisely because our understanding is rooted in our own unique cosmic environment. Speculating about such fundamental concepts is an intriguing intellectual exercise that pushes the boundaries of our imagination and understanding. However, the ultimate nature of such concepts in other universes remains speculative and subject to ongoing exploration and philosophical discussion. However, I am not aware of any attempt at even imagining or conceiving such ideas.
To me, it's impossible, because we can't understand time or space without experiencing it, so likewise, if there are things as fundamental, then we would need to experience them in order to speculate or think about them.