  We present the selection of high-redshift ($z\gtrsim5.7$) radio-loud (RL)
quasi-stellar object (QSO) candidates from the combination of the radio Rapid
ASKAP Continuum Survey (RACS; at 888 MHz) and the optical/near-infrared Dark
Energy Survey (DES). In particular, we selected six candidates brighter than
$S_{\rm 888MHz}>1$ mJy beam$^{-1}$ and ${\rm mag}(z_\mathrm{{DES}})<21.3$ using
the dropout technique (in the $i$-band). From this sample, we were able to
confirm the high-$z$ nature ($z\sim6.1$) of two sources, which are now among
the highest-redshift RL QSOs currently known. Based on our Gemini-South/GMOS
observations, neither object shows a prominent Ly$\alpha$ emission line. This
suggests that both sources are likely to be weak emission-line QSOs hosting
radio jets and would therefore further strengthen the potential increase of the
fraction of weak emission-line QSOs recently found in the literature. However,
further multiwavelength observations are needed to constrain the properties of
these QSOs and of their relativistic jets. From the discovery of these two
sources, we estimated the space density of RL QSOs in the redshift range
$5.9<z<6.4$ to be 0.13$^{+0.18}_{-0.09}$ and found it to be consistent with the
expectations based on our current knowledge of the blazar population up to
$z\sim5$.
