Tikz fit inner sep seperate values for all 4 directions

Question

Assume I have two nodes in tikz and I want to highlight them via tikz fit.
If I want to add a margin I can use inner sep = xpt, however, all 4 sites are increased by the same value. Is it possible to specify for each side a separate value, e.g., inner sep = x1pt x2pt x3pt x4pt?

documentclass[]{standalone}
usepackage{tikz}
usetikzlibrary{fit}

begin{document}
begin{tikzpicture}[every label/.style={text=gray},node distance=2cm]
node[,draw] (n1) {hello};
node[right of=n1,draw] (n2) {hello2};
node[draw,fit=(n1) (n2),inner sep=10pt] (t31) {};

end{tikzpicture}
end{document}

Example of desired outcome:

user194703 · Accepted Answer

This comes with a key fit margins that does what I think you want. You can use it as e.g. in

node[draw,fit margins={left=3pt,right=12pt,bottom=3pt,top=8pt},fit=(n1) (n2)] (t31) {};

to obtain

documentclass[tikz,border=3mm]{standalone}
usetikzlibrary{fit,positioning}
tikzset{fit margins/.style={/tikz/afit/.cd,#1,
    /tikz/.cd,
    inner xsep=pgfkeysvalueof{/tikz/afit/left}+pgfkeysvalueof{/tikz/afit/right},
    inner ysep=pgfkeysvalueof{/tikz/afit/top}+pgfkeysvalueof{/tikz/afit/bottom},
    xshift=-pgfkeysvalueof{/tikz/afit/left}+pgfkeysvalueof{/tikz/afit/right},
    yshift=-pgfkeysvalueof{/tikz/afit/bottom}+pgfkeysvalueof{/tikz/afit/top}},
    afit/.cd,left/.initial=2pt,right/.initial=2pt,bottom/.initial=2pt,top/.initial=2pt}
begin{document}
begin{tikzpicture}[]
node[draw] (n1) {hello};
node[right=of n1,draw] (n2) {hello2};
node[draw,fit margins={left=3pt,right=12pt,bottom=3pt,top=8pt},fit=(n1) (n2)] (t31) {};
end{tikzpicture}
end{document}

I also employ the positioning library for easier positioning.

user30471 · Answer

You can add some points to fit around. For example, to get

use the code:

documentclass[]{standalone}
usepackage{tikz}
usetikzlibrary{fit}

begin{document}
  begin{tikzpicture}[every label/.style={text=gray},node distance=2cm]
    node[draw] (n1) {hello};
    node[right of=n1,draw] (n2) {hello2};
    coordinate[above left of=n1] (n1left);
    node[draw,fit=(n1) (n1left) (n2)] (t31) {};
  end{tikzpicture}
end{document}

Hugh Perkins · Answer

user194703's answer is good, and works, and I up-voted it, and used the information in it, to write this answer. That said, what I am finding works for me is to use the settings user194703 uses in his/her macro, but use them directly, which settings are yshift, xshift, inner xsep and inner ysep, e.g:
tikzstyle{block} = [draw, inner sep=0.2cm, node distance=0.6cm, fill=yellow!10]
begin{figure}
    centering
    begin{tikzpicture}[auto]
    node [block] (sender) {sender};
    node [block] (receiver) [right=of sender] {receiver};
    node (agent) [
          fit=(sender) (receiver),
          yshift=-0.2cm, inner ysep=0.4cm,inner xsep=0.2cm,
          draw,
          label={[label distance=-1.0cm]190:agent}, rounded corners] {};
    end{tikzpicture}
    caption{Sender receiver}
end{figure}

Result:

(basically, the issue I found with the macro is I have to specify all four margins. the macros seems to me to be incompatible with using inner xsep etc myself, since the macro over-rides them).

Tikz fit inner sep seperate values for all 4 directions

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