Which powergrade best suits for this kind of colorgrading?

Both of those people are filming at the best time of day with the best light first of all. It is all about the lighting.
But There are a ton of LUT's that could get you close or even better yet power grades in Davinci.
Not sure what Color grading program you are using but you should be able to get similar color. But you need to be shooting at the best time of day to get that "feeling" from those images you posted..
ON a side note you should not try to replicate that style but try and work on your own style..
You are not going to magically get that look by slapping some LUT on images that do not have a similar lighting to them.

 

Thanks for your comment.
I know that there is no magical solution with one lut.
But good point with time of the day. I will try to shoot at the golden hour.
I was trying to use powergrade kodak 2383 but it was not the same.

I will be trying on my own, thanks.

 

Something like the Serr Powergrades, which I have shared, here are pretty good start, He has plenty of tutorials on YouTube that show his step by step process. There are also Plenty of other tutorials that show how to get that "look" you may be looking for..
So if their tutorials cannot help you, I highly doubt I or anybody else in here are going to be able to help...
Hope that makes sense... There is No "trick" or magic workflow...