We now have termux installed, with access to the the photos on your phone & with dcraw to convert the photo to something that imagemagick can process (after changing the white balance for us, if needed).
There are a lot of better articles about taking IR photos than this one!
Here are a selection of websites from my browsing history on the topic. There are more out there.
Some
I've been messing with infrared photography for a year or so, but was frustrated by the need to take the photo & then go to a full sized computer to be able to process the image...I thought that there had to be a way to take & "develop" the photos using just the phone.