  Diffuse interstellar bands (DIBs) are absorption features seen in optical and
infrared spectra of stars that are probably caused by large and complex
molecules in the ISM. Here we investigate the Galactic distribution and
properties of two DIBs identified in almost six million stellar spectra
collected by the Gaia Radial Velocity Spectrometer. These measurements
constitute a part of the Gaia Focused Product Release to be made public between
the Gaia DR3 and DR4 data releases. In order to isolate the DIB signal from the
stellar features in each individual spectrum, we identified a set of 160 000
spectra at high Galactic latitudes which we consider to be the DIB-free
reference sample. Matching each target spectrum to its closest reference
spectra in stellar parameter space allowed us to remove the stellar spectrum
empirically, without reference to stellar models, leaving a set of six million
ISM spectra. Identifying the two DIBs at 862.1 nm and 864.8 nm in the stacked
spectra, we modelled their shapes and report the depth, central wavelength,
width, and equivalent width (EW) for each, along with confidence bounds on
these measurements. Our main results are as follows: (1) the strength and
spatial distribution of the DIB $\lambda$862.1 are very consistent with what
was found in Gaia DR3, but for this work we attained a higher signal-to-noise
ratio in the stacked spectra to larger distances, which allowed us to trace
DIBs in the outer spiral arm and beyond the Scutum--Centaurus spiral arm; (2)
we produced an all-sky map below ${\pm}65^{\circ}$ of Galactic latitude to
$\sim$4000 pc of both DIB features and their correlations; (3) we detected the
signals of DIB\,$\lambda$862.1 inside the Local Bubble; and (4) there is a
reasonable correlation with the dust reddening found from stellar absorption
and EWs of both DIBs.
