Why aren’t your fields an option anymore? The game still uses the same 2d field format and then the game itself repositions the field to look 3d. You don't actually design the field looking 3d. Just released my usual 2024 real world mod that uses the same field formats as prior versions of the game and everything looks fine. The only thing that I am not sure of is how exactly the goalposts would look without them have a 3D design, I suspect it would just look like a yellow line. I am not really sure there is a way to represent a 3d version of the goalpost via the field image file, may require the developer to superimpose a default goalpost on top of the field within the game itself, if that is even possible. I tried to use one of your images as an example to see how it would look in the game but since the images in the post is just one graphic of all fields combined, the field was blurry and looked stretched so it wouldn't do it justice to show that.
The game does have a league option where the game player can select to see the 3d player images or the previous 2d circle style, but in both cases the game renders the field in 3d. The 3d player models wouldn't look right on a top down 2d field and even if they could/would provide an option to switch between 2d/3d fields, thinking a good portion of game players would likely use the 3d views anyway, although I could be wrong as the default style is the old way. But if somehow when the game player has 2d circle option selected they could give the game player option of using the 2d field view, that would be nice for game players who prefer the previous game style but again, no idea if the way implemented would support that. With all that said, I still think everyone could use what you have done so far with the exception of confirming how the goalposts would be represented.
As an example from my 2024 real world mod, using a 2D file image (same size and format as previous versions of the game), it shows within the game like at the bottom.
Field Image File from Mod
How the Same Field Image Looks within the Game Without any Changes