No there is not any firmware which supports text files as subtitles. There are some more expensive players which support that, but not any Rockchip that I am aware of.
If this player is RK27xx based model, and SDK works for you, you may write your own code for this - but I don't think it's satisfying for you, isn't it?
If the player is RK28xx based model, there is no way at all to do this (no SDK available).
But to be honest, when I first started to dig into SDK for my player, I was planning to make subtitles supported, but then a lot of troubles came out regarding audio for my player, so it was pointless anyway.
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