Keep your originals as CHD, play them as BIN/CUE (or switch emulators). Your hard drive will thank you, and your nostalgia will remain intact.
While there is a "sevenzip" plugin for the Android version of ePSXe to handle compressed files, the desktop version generally requires games to be in an uncompressed or specific container format listed above. PCSX2 Tutorial | Video Game Emulation for Newbies epsxe chd files
However, if you want CHD specifically:
Elias pointed his emulator toward the first CHD file. The screen flickered. For a moment, the familiar white-and-orange logo of his youth hung in the balance. Then, with a crisp chime, the game roared to life. No lag, no stutter, just the pure, compressed magic of 1997. Keep your originals as CHD, play them as
Convert to BIN/CUE or change emulator.