Push array 2 dimensional

Hello, i want to store values in an array without knowing the number of rows it will have, I only know the number of columns. I initialize an array with the topics:

[Numbers,Dates,Colors,Adjective,Time]

Then I store the values in array2 that is [1,2,3,4,5] and I want to add it to the bigger two dimensional array.

[[Numbers,Dates,Colors,Adjective,Time],
[12,2-4-2020,red,green,5:30]]

How can I do this?? Thank you!

I would just use a large fixed number for the array.

But for dynamic arrays see here: https://stackoverflow.com/questions/10451893/javascript-create-simple-dynamic-array

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