I think you can specify the dependencies in DESCRIPTION file https://r-pkgs.org/description.html in particular there is an Imports section
https://r-pkgs.org/description.html#sec-description-imports-suggests
Once you get this more working and in CRAN
I think you can specify the dependencies in DESCRIPTION file https://r-pkgs.org/description.html in particular there is an Imports section
https://r-pkgs.org/description.html#sec-description-imports-suggests
Once you get this more working and in CRAN