The best data I could find was the following
https://wp.unil.ch/space/files/2021/12/SPACE-II_2020_Final_r...Council of Europe Annual Penal Statistics – SPACE II – 2020 - so evidently 2021 not published yet.
that is the full report maybe take this https://wp.unil.ch/space/files/2021/06/KeyFindings_Probation... which is the keyfindings and a quicker read.
Figure 3 on page 5 (in the keyfindings document) - Probation and Prison population rates (per 100,000 inhabitants) on 31st January 2020 shows the median prison population is 103 per 100,000
where probation is concerned
on 31st January 2020, there were 1,512,765 probationers under the supervision of the 31 probation agencies of
the Council of Europe member states which use the person as the counting unit for their stock of probationers...
which would lead to a probation population rate of 311 probationers per 100,000
inhabitants. However, when the European median value is estimated on the basis of the population and the
number of probationers of each country, it corresponds to 149 probationers per 100,000 inhabitants
in Table 3 on page 16 shows Composition of the probation and prison populations on 31st January 2020 and mortality during 2019.
Is your suggestion that some part of these deaths are killings by the EU authorities as a part of policy / extrajudicial killing, or do you mean that there are other deaths that are not in this table. If so - your sources for this claim please?