How match this broadcast standards with Premiere and ffmpeg
To legalize video with the Video Limiter:


Set the Reduction Axis to Chroma and Luma.
Set the Signal Minimum to 0% (=0 mV).
Set the Signal Maximum to 103% (=700 mV + 3%).


The rest of the settings may take some experimentation to find something that looks good for your project.

I strongly recommend double checking you are within limits with a good gamut visualization. I'm partial to the Tektronix split diamond display, but other test equipment vendors have other good versions. If you are going to be delivering a lot of files, a file-based QC system will also be able to check for legal colors and some can even do the correction.

Something to take in to consideration, depending on the broadcaster you are delivering to, they may not enforce the gamut requirements all that strictly. I know that most in the US don't, unless you are severely and noticeably out of gamut.