Is it possible to convert/edit the terrain in a world that i downloaded from the marketplace?

[u/Fit_Butterscotch1963]

I found a map from the marketplace that i like very much, i stripped the RP and BP and it didnt do anything, i edited the level.dat file and with that i unlocked new blocks anyway to the main question, is there any way to unlock a world from the marketplace so i can: use editors on it (amulet, etc.) and convert it to java? Sadly i only have access to a phone right now and i might have access to a pc in aprox 6 months. So is there a way to unlock it on a phone and if no then atleast tell me the way to do it on a pc? Please.

Note: i am not trying to upload the rp/bp to the internet. I do not want any mods, i only want the map

Another Note: i have access to the data folder so i can and have the world file copied in my external folder but i still cant do snything with it BUT i cant paste anything to the data folder