  We present the combination of ALMA-IMF and single-dish continuum images from
the Mustang-2 Galactic Plane Survey (MGPS90) at 3 millimeters and the Bolocam
Galactic Plane Survey (BGPS) at 1 millimeter. Six and ten out of the fiffteen
ALMA-IMF fields are combined with MGPS90 and BGPS, respectively. The
combination is made via the feathering technique. We used the dendrogram
algorithm throughout the combined images, and performed further analysis in the
six fields with combination in both bands (G012.80, W43-MM1, W43-MM2, W43-MM3,
W51-E, W51-IRS2). In these fields, we calculated spectral index maps and used
them to separate regions dominated by dust or free-free emission, and then
performed further structural analysis. We report the basic physical parameters
of the dust-dominated (column densities, masses) and ionized (emission
measures, hydrogen ionization photon rates) structures. We also searched for
multi-scale relations in the dust-dominated structures across the analyzed
fields, finding that the fraction of mass in dendrogram leaves (which we label
as "Leaf Mass Eficiency", LME) as a function of molecular gas column density
follows a similar trend: a rapid, exponential-like growth, with maximum values
approaching 100% in most cases. The observed behaviour of the LME with gas
column is tentatively interpreted as an indicator of large star formation
activity within the ALMA-IMF protoclusters. W51-E and G012.80 stand out as
cases with comparatively large and reduced potential for further star
formation, respectively.
