It's hard for me to decide how good or bad this is. It feels like there is room for some interesting developments but having a plot of being the 'only' person who do this role while not being powerful herself creates an uncomfortable dynamic where she is obligated to throw her lot in with someone who can protect her from an entire world filled with people who would literally kill to have her.
I do find the concept intriguing but I can't overstate how unpleasant it is to consider things from her point of view and the very real likelihood of becoming enslaved with no natural allies to start with. To be fair, other isekai would just make the MC more of a mary sue with genius level diplomacy or planning so I guess it's better to have a MC who actually has to struggle on that front.
