Write a loop to use the function polyserial

General
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1

I need to make a correlation matrix for the related selected categorical variables and numerical variables, using the function polyserial(). However, i can only call the function for two variables one time and wonder if there are any ways to write a loop that can generate the matrix for once.

df = read.csv("mydata.csv")

df2 = df %>% 
  select(confidence,r_med_adherence,a,b,c,d,e)

# a,b,c,d,e are the categorical variables, I like to see the correlation between them and confidence,r_med_adherence
# I can only test one by one
polyserial(df$r_med_adherence,df$a)
polyserial(df$r_med_adherence,df$b)
polyserial(df$r_med_adherence,df$c)
2

I think those 3 lines are equivalent to

lapply(c("a", "b", "c"), \(x){
           polyserial(df$r_med_adherence,df[[x]])
         })