Question. Reuse terminal to execute new command

I am writing plugin, which can build project. Looks good to use toggleterm as environment to run build command. I don't want to allow user to execute any other commands but build, so i create terminal as
```lua
local cmake_build = Terminal:new({ cmd = "cmake --build ...", --[...]-- })
```
But, when building is done, user may want to build project again. I don't want to delete this terminal and open new one, since it requires for me to throw old terminal's size to new one and other boilerplate. Is it possible to kinda reinitialise terminal keeping same window, buffer and other it's parameters, except `cmd`, `env` and other i want to update. Or, maybe, it is possible to attach new terminal to old terminal's buffer, deleting the old one?

I still haven't fully decided how best to solve this problem, so I'd be glad to know about the method I'm missing. Thanks