NCS - custom .conf file to use with mcuboot

I am trying to build my application together with mcuboot, which is done automatically by NCS. To do it as I want to, I need to provide some configs for the mcuboot build. Is there any way to pass any custom options to mcuboot? Lets say also, that I have few targets and I want to provide different .conf for each of them, how can I do that? Using pure Zephyr, building with mcuboot can be done using sysbuild, which also provide way to add custom configs, f.e. using mcuboot_ prefix or sysbuild.cmake/conf files. With NCS the mcuboot is builtand merged automatically, as I noticed, I cannot pass any configs with prefixes. 

I am using nrf9160dk with NCS v2.5.0.

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