redirect output to function instead then saving to files

Question

I have a list of data frames (list_CLUMP) in R with all the same number of columns and rows. Then I save them to files and I use them as input for a function that takes a bash script as commands. The bash script takes each file as input at --clump:

sapply(names(list_CLUMP), 
       function (x) write_tsv(list_CLUMP[[x]],file=paste(x, "stats.tsv", sep=".") )) 

split_and_clump <- function (gwas_file){
  reference_bed="Geno_filtered_common_allmale"
  p_thresh = 0.005
  files_out<-gsub(pattern=".stats.tsv", 
                  replacement=".clumped", 
                  x=gwas_file)
  plink_command <- paste0(
    "plink --bfile ", reference_bed,
    #    " --thin-indiv-count 100000 ",
    " --clump ", gwas_file,
    " --clump-r2 0.05 --clump-kb 500 --clump-p1 ", p_thresh,
    " --out ", files_out)
  system(plink_command)}


#### add PLINK command to PATH !!!!!

Sys.getenv("PATH")
old_path <- Sys.getenv("PATH")

Sys.setenv(PATH = paste(old_path, "/usr/local/Caskroom/miniconda/base/bin:/usr/local/Caskroom/miniconda/base/condabin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin
", sep = ":"))

files<-list.files(pattern = "*tsv")
lapply(files, split_and_clump)

I would like to pass the R list directly to the function, to the bash commands rather than saving the data frames to files and then use the files for input of the function. Any suggestion?