In general, no. A normal Bayer sensor only gives you three filtered pixel types, and those color filters are broad and overlapping. After removing the camera’s IR-cut filter, the Bayer filters still do not become clean, separate infrared bands, so you can’t reliably recover four independent channels (R, G, B, and NIR) from one RAW file.

In theory, if you had the exact spectral response curves of the sensor and Bayer filters, you might try to mathematically separate some IR contribution, but the overlap is usually too large for this to work well.

Also, most commonly available IR filters are long-pass filters, not narrow band-pass filters, so they don’t divide infrared into distinct bands for the RGB channels.

A practical approach is to make two exposures—one with visible light included and one with an IR-pass filter—and compare or subtract them to isolate infrared influence.

You can also create false-color infrared images by remapping channels (for example, IR to red, red to green, green to blue), but that is a creative rendering, not true four-band capture.