Plenty of utilities capable of transforming LUA scripts to TNS document format used in TI-Nspire devices. You can even find some websites with online converters that can quickly perform this conversion. Your best option is look for websites focused on TI calculators.
Convert Lua script to TI-Nspire document.
We have found one software suitable in our database for this conversion.
On-line services software - convert lua to tns on web
Lua>>TNS converter is an online tool that allows users to convert lua script to TI .tns file using their web browser connected to internet.
Convert from lua file
to tns file
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.