How to make a block width in a certain number of columns in flex?

Question

css

For example, I need a block to start with a side column, be two columns wide, and then a void of 3 columns.
I am attaching a screenshot. Those. you want the title to be two columns wide and centered on the two columns. this title belongs to them. The whole point is that all these widgets should be top-aligned take.ms/baMJm I'm just starting to typeset and I've already broken my head on how to do it. Please explain in understandable language.