I checked and meson.build is missing jlink support. So this needs to be fixed upstream to enable in the package.
- Bug#976639: flashrom does not support jlink_spi Marc Schink
- Bug#976639: flashrom does not support jlink_spi Limonciello, Mario
- Bug#976639: flashrom does not support jlink_sp... Marc Schink
- Bug#976639: flashrom does not support jlin... Limonciello, Mario
- Bug#976639: flashrom does not support ... Marc Schink