Add arbirary text to list of citations from within the body text of the document using natbib

I want to add a note to my list of citations with text in it, using the same numbering as the other citations.

MNWE:

documentclass[]{article}
usepackage[utf8]{inputenc} %Allows UTF8 input. 
begin{filecontents}{footnote.bib}
    @Article{Brown,
        author ="Brown, Matthew L. and Van Wieren, Ken and Tailor, Hamel N. and Hartling, David and Jean, Anthony and Merbouh, Nabyl",
        title  ="Three-dimensional printing of ellipsoidal structures using Mercury",
        journal  ="CrystEngComm",
        year  ="2018",
        doi  ="10.1039/C7CE01901G",
    }
    @article{Merbouh,
        author = {Van Wieren, Ken and Tailor, Hamel N. and Scalfani, Vincent F. and Merbouh, Nabyl},
        title = {Rapid Access to Multicolor Three-Dimensional Printed Chemistry and Biochemistry Models Using Visualization and Three-Dimensional Printing Software Programs},
        journal = {J.~Chem. Ed.},
        year = {2017},
        doi = {10.1021/acs.jchemed.6b00602},
    }
end{filecontents}
usepackage[utf8]{inputenc}
usepackage[super,sort&compress,comma]{natbib} 
usepackage[T1]{fontenc}
usepackage{natmove}  
begin{document}
    The structure is then exported as a Virtual-Reality Markup Language file (*.wrl or VRML) as outlined previously.cite{Brown,Merbouh} This file is then imported into magics where the Split Part by Colour command is used. Each of the resulting parts is then saved as a separate StereoLithography  (*.stl or STL) file.footnote{Stereolithography files were used instead of virtual-reality markup language files due to a bug in this version of Magics that resulted in the structures being shrunk by a factor of 100 every time they were saved as a VRML file.} 
    The structures where was then re-opened in Magics one at a time and the repair functions were used to correct the errors created by Mercury’s export function. 
    bibliography{footnote}
    bibliographystyle{abbrvnat} %chagned from the RSC's .bst file
end{document}

And the output of this (Blank space in the middle of the page edited out):

What I would like is the text inside of footnote to show up in the list of citations as 3, and then the next citation after it to appear as 4 and so on. The intended effect can by seen in this paper (made in Word) in entries 7 and 8.

documentclass{article}

begin{filecontents}{MWE2.bib}
@Article{Brown,
    author ="Brown, Matthew L. and Van Wieren, Ken and Tailor, Hamel N. and Hartling, David and Jean, Anthony and Merbouh, Nabyl",
    title  ="Three-dimensional printing of ellipsoidal structures using Mercury",
    journal  ="CrystEngComm",
    year  ="2018",
    doi  ="10.1039/C7CE01901G",
}
end{filecontents}

usepackage[utf8]{inputenc}
usepackage[T1]{fontenc}

usepackage{notes2bib}

usepackage[super,sort&compress,comma]{natbib} 

begin{document}
This is example textcite{Brown}.
Now this is text that needs a bibnotebibnote[round]{Structure measured with calipers and rounded to the nearest}.
Now I need to refer to that bibnote againcitenote{round}

bibliography{MWE2}
bibliographystyle{abbrvnat}

end{document}