I don't have anything for this season, but Devin Booker drained the most free throws in the 2021 playoffs, with 133 made.

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players with most free throws this playoffs
BookerGeorgeAntetokounmpoYoungEmbiidDurantMiddletonLeonardMitchellPaulHardenGallinariLillardJokicTatumGobertHolidayZubacAytonLopezJacksonBogdanovicDavisHarrisWestbrook133130121116918886666357564947464542403939373636353534
NAMEGPFTMMPGPPGRPGAPGSPGBPGTPGFGMFGAFG%3PM3PA3P%FTAFT%MINPTSREBASTSTLBLKTOVPF+/-
Devin BookerDevin Booker2213340.427.35.64.50.80.23.79.621.544.72.06.232.16.790.58896011241001848176+112
Paul GeorgePaul George1913040.826.99.65.41.00.53.58.719.744.12.78.033.68.184.477651118310219106759+73
Giannis AntetokounmpoGiannis Antetokounmpo2112138.130.212.85.11.01.23.011.920.956.90.63.318.69.858.780063426910821256461+130
Trae YoungTrae Young1611637.728.82.89.51.30.04.09.422.441.82.89.031.38.486.6603461451522006435-7
Joel EmbiidJoel Embiid119132.528.110.53.41.01.53.89.217.951.31.53.739.09.983.53573091163711164233+121
Kevin DurantKevin Durant128840.434.39.34.41.51.63.512.123.551.42.86.840.28.487.14854111115318194231+34
Khris MiddletonKhris Middleton238640.123.67.65.11.50.23.28.619.743.82.67.634.34.288.79225421741183547458+119
Kawhi LeonardKawhi Leonard116639.330.47.74.42.10.82.211.119.457.32.25.539.36.888.043233485482392429+28
Donovan MitchellDonovan Mitchell106334.632.34.25.51.10.22.810.523.544.75.011.543.57.682.934632342551122820+19
Chris PaulChris Paul205734.219.23.58.61.20.22.27.515.049.71.53.344.63.387.7683384701712334348+62
James HardenJames Harden95635.820.26.38.61.70.72.95.712.047.22.77.336.46.990.332218257771562623+55
Danilo GallinariDanilo Gallinari184924.612.83.90.80.30.20.84.19.742.51.94.740.52.994.24422317014631546-25
Damian LillardDamian Lillard64741.334.34.310.21.00.72.210.322.346.35.813.044.98.394.0248206266164139+27
Nikola JokicNikola Jokic104634.529.811.65.00.60.92.411.622.850.92.05.337.75.583.634529811650692423-57
Jayson TatumJayson Tatum54537.030.65.84.61.21.62.69.422.242.32.87.238.99.891.81851532923681315-58
Rudy GobertRudy Gobert114234.214.712.30.80.52.11.55.57.474.10.00.10.06.063.637616213596231746+33
Jrue HolidayJrue Holiday234039.717.35.78.71.70.42.46.916.940.61.96.230.32.471.491239913219938105648+160
Ivica ZubacIvica Zubac173917.76.35.80.40.10.70.92.03.459.60.00.02.979.63011079972121633-16
Deandre AytonDeandre Ayton223936.415.811.81.10.81.11.37.010.665.80.00.02.473.68013472602518242863+82
Brook LopezBrook Lopez233729.013.05.90.30.71.51.15.29.454.81.03.131.91.986.0667298135617342548+66
Reggie JacksonReggie Jackson193632.717.83.23.40.90.21.56.413.348.43.17.540.82.287.862233860651832849+107
Bojan BogdanovicBojan Bogdanovic113635.518.14.31.50.90.02.15.812.546.73.26.946.13.787.839019947161002327+10
Anthony DavisAnthony Davis53528.817.46.62.60.61.61.25.012.440.30.42.218.28.483.31448733133869-16
Tobias HarrisTobias Harris123536.521.88.53.51.00.41.58.817.948.81.33.637.23.387.5438261102421251829+53
Russell WestbrookRussell Westbrook53437.219.010.411.80.40.24.25.616.833.31.04.025.08.679.1186955259212117-60