Web MVVM design pattern other Model Join

I have a question in the MVVM pattern architecture.

MODEL : A (a,b,c) B(e,f,g)

ViewModel :

View : need A(a,b)+B(e,f)

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View need data[ A(a,b) + B(e,f) ] to draw the screen.

How to Join Model According to MVVM rules

My thoughts are as follows

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Type A :

MODEL : A (a,b,c) B(e,f,g)

ViewModel : ModelJoin [A(a,b) + B(e,f)] -> Join data and call axios

View : need A(a,b)+B(e,f)

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Type B :

MODEL : A (a,b,c) B(e,f,g) -> C(a,b,e,f)

ViewModel : getC(a,b,e,f) -> axios (where load func)?

View : need A(a,b)+B(e,f)