You can't get a TI-BASIC program to show up in Ion.
To have it show up in MirageOS, all you need to do is add a colon at the beginning of your program. Optionally, you can add a double quote followed by a description:
::"My First Program
:Disp "Hello world!"
TI-BASIC programs show up in DoorsCS by default, but you can customize the behavior by the optional headers listed
here.