I’m afraid not. Only open source way of achieving that, that I can think of would be self hosting stable diffusion and using web ui on your phone. Which probably wouldn’t be really easy nor convenient.
A long shot would be making a feature request for ImageToolbox to implement something like that.
I’m not a stable diffusion guru, but yeah, you can remove objects using inpaint feature. It definitely wouldn’t be straight forward thing to do though, and probably not a great experience since web ui is not really good on the mobile devices, but I haven’t used it in a while, maybe it got improved.
¯\(ツ)/¯ I couldn’t have known you already did.