No, I do not have a number. My information comes from a commentator who mentioned it on TV and I do not remember the person's name. She did cite the Manafort case as a specific example where one or more known Trump supporters were on the jury.
Your question prompted me to look deeper. What I found enhanced my faith in the jury selection process and system.
Per Google Bard:
"Yes, there were Trump supporters on the juries for the Manafort trials. One of the jurors in the first trial, Paula Duncan, has spoken publicly about her experience. She said that she is a Trump supporter and that she drove to the courthouse every day with her "Make America Great Again" hat in the back seat. She also said that she planned to vote for Trump again in 2020.
"Duncan said that she didn't want Manafort to be guilty, but she voted to convict him because the evidence of his guilt was "overwhelming." She also said that she was "very disappointed" in Trump's comments about the trial, which she called 'unpresidential.'
"It is important to note that Duncan was not the only Trump supporter on the jury. Other jurors have also said that they were Trump supporters, but they have not spoken publicly about their experiences."
When I asked Bard about the Jan 6 trials, it answered:
"It is possible that there were Trump supporters on the juries for the January 6 riot trials, but it is difficult to say for sure. Jurors are not required to disclose their political affiliations, and they are instructed to set aside their personal beliefs and biases when deliberating.
"However, some of the jurors in these trials have spoken publicly about their experiences, and some of them have revealed that they are Trump supporters. For example, one juror in the trial of Guy Reffitt said,"I was able to set aside my personal beliefs and vote based on the evidence presented in court," the juror said. "The evidence was overwhelming."
When I asked Bard for more, Bard said:
'Yes, there are other cases where Trump supporters have spoken publicly about their jury experience.
"For example, in the trial of Roger Stone, a longtime associate of former President Trump, one of the jurors, Tomeka Hart, spoke publicly after the trial about her experience as a Trump supporter on the jury. She said that she was initially skeptical of the evidence against Stone, but that she ultimately voted to convict him because she felt that the evidence was overwhelming. She also said that she was not pressured by the other jurors to vote to convict.
"In another case, in the trial of Michael Cohen, Trump's former personal lawyer, one of the jurors, Joanna Hendon, spoke publicly after the trial about her experience as a Trump supporter on the jury. She said that she was initially hesitant to believe the evidence against Cohen, but that she ultimately voted to convict him because she felt that the evidence was credible.
Above, when I said prosecutors will "carefully screen," I did not mean they will screen Trump supporters out. The examples above clearly show prosecutors do not do that. If they did, there would be no Trump supporters on the juries, but, obviously, there are indeed Trump supporters on these juries. I meant prosecutors will carefully screen for jurors who can set aside their political believes and sit in judgement of the facts in evidence.
It is quite interesting, isn't it? We see Trump supporters being selected as jurors who then take their juror duties seriously and act accordingly.
I have expressed faith in the jury selection process and jury system before here on EO. That's because I have been twice called for jury duty and am personally familiar with the process. Having seen what I've seen, and now reading the confirming info above, I have great faith that Trump's attorneys, prosecutors and the judges can together assemble juries that will fairly hear and decide on the matters at hand.
I believe that will be equally true in the trials in Washington, DC, Atlanta Ga, and Fort Pierce FL.