HELP: Reading Japanese txt files on tablet WITH DICTIONARY

Hello all. I have a few txt files of scripts and various things that I want to read on my android tablet. I have a couple of readers that display the text fine and I can view them no problem. The problem/question that I'm trying to figure out is how to look up words [conveniently] on the tablet while reading.

I'm used to using my desktop and yomichan for internet reading and my desktop plus epwing for anything else. Yomichan is by far the easiest and fastest and I'm wondering if something like that exists on tablets where I can read the text and then highlight the words I don't know to show the meaning.

Yes I can use a dictionary on my phone/pc but I'm trying to read more casually and I just want to pick up my tablet and read off of it without the extras.

I tried using chrome to read the txt file locally, but yomichan doesn't work that way so it kind of defeats the purpose.

Anyway I'm sure there's a few easy answers I just don't know them! Thanks for the help!!!