No problem @Jason, I know it’s not the exact answer you were hoping for.
And unfortunately, it’s just the one right now. That was another point of feedback I saw in the Forum. (That it would be nice to be able to upload more than the target language SRT.)
It’s supposed to use machine translation to translate from your target language into your native language automatically (again, not the best but worth a shot to see if it suits your needs for now.)
Hoping the LR devs add the ability to use two SRT files (one for TL and the other for a fluent language of choice) to their to-do list.
P.S. This is one request I found related to the two files with Video File tool: Mode - file player (improve it please)